From 8d39d5a50141ba5addac685be2653da7a9f95c8d Mon Sep 17 00:00:00 2001
From: Son Ho
Date: Wed, 12 Jan 2022 20:31:23 +0100
Subject: Regenerate the trace

---
 tests/trace_reference.txt | 43843 +++++++++++++++-----------------------------
 1 file changed, 14560 insertions(+), 29283 deletions(-)

diff --git a/tests/trace_reference.txt b/tests/trace_reference.txt
index 3e0483f8..acf83e51 100644
--- a/tests/trace_reference.txt
+++ b/tests/trace_reference.txt
@@ -969,88 +969,6 @@ fn id_mut_mut_test1() {
   return
 }
 
-fn id_mut_mut_test2() {
-  var@0 : ();
-  x : i32;
-  px : &'_ mut (i32);
-  ppx : &'_ mut (&'_ mut (i32));
-  ppy : &'_ mut (&'_ mut (i32));
-  var@5 : &'_ mut (&'_ mut (i32));
-  y : i32;
-  py : &'_ mut (i32);
-  var@8 : &'_ mut (i32);
-  var@9 : bool;
-  var@10 : bool;
-  var@11 : i32;
-  var@12 : bool;
-  var@13 : bool;
-  var@14 : i32;
-  var@15 : bool;
-  var@16 : bool;
-  var@17 : i32;
-
-  x := 0: i32;
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-}
-
-fn id_mut_mut_test3() {
-  var@0 : ();
-  x : i32;
-  px : &'_ mut (i32);
-  ppx : &'_ mut (&'_ mut (i32));
-  ppy : &'_ mut (&'_ mut (i32));
-  var@5 : &'_ mut (&'_ mut (i32));
-  ppz : &'_ mut (&'_ mut (i32));
-  var@7 : &'_ mut (&'_ mut (i32));
-  var@8 : bool;
-  var@9 : bool;
-  var@10 : i32;
-  var@11 : bool;
-  var@12 : bool;
-  var@13 : i32;
-
-  x := 0: i32;
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
-}
-
 [Debug] test_unit_function: test2
 [Debug] 
 **About to evaluate statement**: [
@@ -109595,32 +109513,12 @@ move var@9
 
 
 
-[Debug] test_unit_function: id_mut_mut_test2
+[Debug] test_function_symbolic: add_test
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32;
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@3 := copy x;
+  var@4 := copy y;
+  var@0 := copy var@3 + copy var@4;
   return
 ]
 
@@ -109630,31 +109528,19 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32
+  var@3 := copy x
 ]
 
 **Context**:
@@ -109663,24 +109549,12 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
@@ -109692,54 +109566,22 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 - op:
-0: i32
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@4 := copy y;
+  var@0 := copy var@3 + copy var@4;
   return
 ]
 
@@ -109749,31 +109591,19 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  px := &mut x
+  var@4 := copy y
 ]
 
 **Context**:
@@ -109782,51 +109612,38 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
+}
+
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
+- op:
+copy y
 
 [Debug] 
 **About to evaluate statement**: [
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@0 := copy var@3 + copy var@4;
   return
 ]
 
@@ -109836,31 +109653,19 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppx := &mut px
+  var@0 := copy var@3 + copy var@4
 ]
 
 **Context**:
@@ -109869,84 +109674,57 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
 
-**Context**:
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
+}
+
+
+- op:
+copy var@3
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
+- op:
+copy var@4
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := &two-phase *(ppx)
+  return
 ]
 
 **Context**:
@@ -109955,49 +109733,22 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> s@2 : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
+[Debug] test_function_symbolic: subs_test
 [Debug] 
 **About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@3 := copy x;
+  var@4 := copy y;
+  var@0 := copy var@3 - copy var@4;
   return
 ]
 
@@ -110007,31 +109758,19 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5)
+  var@3 := copy x
 ]
 
 **Context**:
@@ -110040,30 +109779,16 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
-[Debug] activate_inactivated_mut_borrow: resulting value:
-&mut@0 (0: i32)
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -110071,192 +109796,161 @@ move var@9
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 - op:
-move var@5
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := &mut *(x);
-  var@0 := &mut *(var@2);
+  var@4 := copy y;
+  var@0 := copy var@3 - copy var@4;
   return
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := &mut *(x)
+  var@4 := copy y
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
-# Frame 1:
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
 {
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
+- op:
+copy y
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := &mut *(var@2);
+  var@0 := copy var@3 - copy var@4;
   return
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (&mut@0 (0: i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := &mut *(var@2)
+  var@0 := copy var@3 - copy var@4
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
-# Frame 1:
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
 {
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (&mut@0 (0: i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
+}
+
+
+- op:
+copy var@3
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
 
+- op:
+copy var@4
 
 [Debug] 
 **About to evaluate statement**: [
@@ -110265,130 +109959,89 @@ move var@5
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> s@2 : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : (u32, bool) ;
 }
 
-# Frame 1:
-{
-  Some (var@0) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (⌊mut@4⌋) ;
-}
 
 
+[Debug] test_function_symbolic: div_test
+[Debug] 
+**About to evaluate statement**: [
+  var@3 := copy x;
+  var@4 := copy y;
+  var@0 := move var@3 / move var@4;
+  return
+]
 
-[Debug] ctx_pop_frame:
+**Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
-# Frame 1:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  var@3 := copy x
+]
+
+**Context**:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
 {
-  Some (var@0) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
+
+
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 - op:
-move var@0
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@4 := copy y;
+  var@0 := move var@3 / move var@4;
   return
 ]
 
@@ -110398,34 +110051,19 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppy)) := 1: i32
+  var@4 := copy y
 ]
 
 **Context**:
@@ -110434,27 +110072,12 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
@@ -110466,52 +110089,21 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 - op:
-1: i32
+copy y
 
 [Debug] 
 **About to evaluate statement**: [
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@0 := move var@3 / move var@4;
   return
 ]
 
@@ -110521,34 +110113,19 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  y := 2: i32
+  var@0 := move var@3 / move var@4
 ]
 
 **Context**:
@@ -110557,27 +110134,12 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
@@ -110589,88 +110151,40 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 - op:
-2: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
+move var@3
 
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 2: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
+- op:
+move var@4
 
 [Debug] 
 **About to evaluate statement**: [
-  py := &mut y
+  return
 ]
 
 **Context**:
@@ -110679,48 +110193,22 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 2: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> s@2 : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 
+[Debug] test_function_symbolic: rem_test
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@3 := copy x;
+  var@4 := copy y;
+  var@0 := move var@3 % move var@4;
   return
 ]
 
@@ -110730,34 +110218,19 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (2: i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := &mut *(py)
+  var@3 := copy x
 ]
 
 **Context**:
@@ -110766,47 +110239,39 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (2: i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
+}
+
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
+- op:
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@4 := copy y;
+  var@0 := move var@3 % move var@4;
   return
 ]
 
@@ -110816,34 +110281,19 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> &mut@6 (2: i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(ppy) := move var@8
+  var@4 := copy y
 ]
 
 **Context**:
@@ -110852,27 +110302,12 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> &mut@6 (2: i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
@@ -110884,150 +110319,21 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> &mut@6 (2: i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 - op:
-move var@8
-
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⊥ : &'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> &mut@6 (2: i32) ;
-  None -> &mut@0 (1: i32) ;
-}
-
-[Debug] give_back:
-- bid: 0
-- content: &mut@0 (1: i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⊥ : &'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> &mut@6 (2: i32) ;
-  None -> ⊥ : &'_ mut (i32) ;
-}
-
-
-[Debug] give_back_value:
-- bid: 0
-- value: 1: i32
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⊥ : &'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> &mut@6 (2: i32) ;
-  None -> ⊥ : &'_ mut (i32) ;
-}
-
+copy y
 
 [Debug] 
 **About to evaluate statement**: [
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@0 := move var@3 % move var@4;
   return
 ]
 
@@ -111037,34 +110343,19 @@ move var@8
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@11 := copy *(px)
+  var@0 := move var@3 % move var@4
 ]
 
 **Context**:
@@ -111073,27 +110364,12 @@ move var@8
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
@@ -111105,524 +110381,246 @@ move var@8
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@0 : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
 
 - op:
-copy *(px)
+move var@3
 
-[Debug] end borrow: 1:
-- original context:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> s@1 : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
-[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 2))
-[Debug] end borrow: 2:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-}
 
-[Debug] end borrow: 2: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 3))
-[Debug] end borrow: 3:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
+- op:
+move var@4
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-}
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
 
-[Debug] end borrow: 3: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 4))
-[Debug] end borrow: 4:
-- original context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> s@2 : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : bool ;
 }
 
-[Debug] give_back:
-- bid: 4
-- content: &mut@4 (&mut@6 (2: i32))
-- context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-}
 
+[Debug] test_function_symbolic: test2
+[Debug] 
+**About to evaluate statement**: [
+  x := 23: u32;
+  y := 44: u32;
+  z := 67: u32;
+  var@5 := copy x;
+  (p).x := move var@5;
+  (p).y := 67: u32;
+  (s as test1::Sum::Right).0 := true;
+  set_discriminant(s, 1);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
+  return
+]
 
-[Debug] give_back_value:
-- bid: 4
-- value: &mut@6 (2: i32)
-- context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (x) -> ⊥ : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
-[Debug] end borrow: 3:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (&mut@6 (2: i32)) ;
-}
+[Debug] 
+**About to evaluate statement**: [
+  x := 23: u32
+]
 
-[Debug] give_back:
-- bid: 3
-- content: &mut@3 (&mut@6 (2: i32))
-- context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> ⊥ : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
-[Debug] give_back_value:
-- bid: 3
-- value: &mut@6 (2: i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
-
 
-[Debug] end borrow: 2:
-- original context:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (&mut@6 (2: i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> ⊥ : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
-[Debug] give_back:
-- bid: 2
-- content: &mut@2 (&mut@6 (2: i32))
-- context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
+- op:
+23: u32
 
+[Debug] 
+**About to evaluate statement**: [
+  y := 44: u32;
+  z := 67: u32;
+  var@5 := copy x;
+  (p).x := move var@5;
+  (p).y := 67: u32;
+  (s as test1::Sum::Right).0 := true;
+  set_discriminant(s, 1);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
+  return
+]
 
-[Debug] give_back_value:
-- bid: 2
-- value: &mut@6 (2: i32)
-- context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
-[Debug] end borrow: 1:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@6 (2: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
+[Debug] 
+**About to evaluate statement**: [
+  y := 44: u32
+]
 
-[Debug] give_back:
-- bid: 1
-- content: &mut@1 (&mut@6 (2: i32))
-- context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
-[Debug] give_back_value:
-- bid: 1
-- value: &mut@6 (2: i32)
-- context:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
+- op:
+44: u32
+
 [Debug] 
 **About to evaluate statement**: [
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  z := 67: u32;
+  var@5 := copy x;
+  (p).x := move var@5;
+  (p).y := 67: u32;
+  (s as test1::Sum::Right).0 := true;
+  set_discriminant(s, 1);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
   return
 ]
 
@@ -111633,33 +110631,23 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> 2: i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@10 := move var@11 == 2: i32
+  z := 67: u32
 ]
 
 **Context**:
@@ -111669,63 +110657,19 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> 2: i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> 2: i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
-- op:
-move var@11
 
 [Debug] eval_operand:
 - ctx:
@@ -111735,45 +110679,33 @@ move var@11
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 - op:
-2: i32
+67: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@5 := copy x;
+  (p).x := move var@5;
+  (p).y := 67: u32;
+  (s as test1::Sum::Right).0 := true;
+  set_discriminant(s, 1);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
   return
 ]
 
@@ -111784,33 +110716,23 @@ move var@11
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> true ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := ¬ move var@10
+  var@5 := copy x
 ]
 
 **Context**:
@@ -111820,26 +110742,16 @@ move var@11
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> true ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
@@ -111852,44 +110764,32 @@ move var@11
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> true ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 - op:
-move var@10
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  (p).x := move var@5;
+  (p).y := 67: u32;
+  (s as test1::Sum::Right).0 := true;
+  set_discriminant(s, 1);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
   return
 ]
 
@@ -111900,33 +110800,23 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> false ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> 23: u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@9)
+  (p).x := move var@5
 ]
 
 **Context**:
@@ -111936,26 +110826,16 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> false ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> 23: u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
@@ -111968,43 +110848,35 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> false ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
+  Some (var@5) -> 23: u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 - op:
-move var@9
+move var@5
 
+[Debug] expand_bottom_value_from_projection:
+pe: (Expressions.Field ((Expressions.ProjAdt (0, None)), 0))
+ty: (Types.Adt ((Types.AdtId 0), [],
+   [(Types.Integer Types.U32); (Types.Integer Types.U32)]))
 [Debug] 
 **About to evaluate statement**: [
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  (p).y := 67: u32;
+  (s as test1::Sum::Right).0 := true;
+  set_discriminant(s, 1);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
   return
 ]
 
@@ -112015,33 +110887,23 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = ⊥ : u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(px) := 3: i32
+  (p).y := 67: u32
 ]
 
 **Context**:
@@ -112051,26 +110913,16 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = ⊥ : u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
@@ -112083,42 +110935,30 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = ⊥ : u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 - op:
-3: i32
+67: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  (s as test1::Sum::Right).0 := true;
+  set_discriminant(s, 1);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
   return
 ]
 
@@ -112129,33 +110969,23 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@14 := copy x
+  (s as test1::Sum::Right).0 := true
 ]
 
 **Context**:
@@ -112165,27 +110995,17 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
+}
 
 
 
@@ -112197,41 +111017,32 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 - op:
-copy x
+true
 
+[Debug] expand_bottom_value_from_projection:
+pe: (Expressions.Field ((Expressions.ProjAdt (6, (Some 1))), 0))
+ty: (Types.Adt ((Types.AdtId 6), [], [(Types.Integer Types.U32); Types.Bool]))
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  set_discriminant(s, 1);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
   return
 ]
 
@@ -112242,33 +111053,23 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> 1: i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := move var@14 == 1: i32
+  set_discriminant(s, 1)
 ]
 
 **Context**:
@@ -112278,106 +111079,26 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> 1: i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> 1: i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
-
-
-- op:
-move var@14
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
-- op:
-1: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  (o as test1::One::One).0 := 3: u64;
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
   return
 ]
 
@@ -112388,33 +111109,23 @@ move var@14
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> true ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := ¬ move var@13
+  (o as test1::One::One).0 := 3: u64
 ]
 
 **Context**:
@@ -112424,26 +111135,16 @@ move var@14
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> true ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
@@ -112456,39 +111157,30 @@ move var@14
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> true ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> ⊥ : test1::One<u64> ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 - op:
-move var@13
+3: u64
 
+[Debug] expand_bottom_value_from_projection:
+pe: (Expressions.Field ((Expressions.ProjAdt (2, (Some 0))), 0))
+ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  set_discriminant(o, 0);
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
   return
 ]
 
@@ -112499,33 +111191,23 @@ move var@13
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> false ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> test1::One::One { 0 = 3: u64; } ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@12)
+  set_discriminant(o, 0)
 ]
 
 **Context**:
@@ -112535,71 +111217,51 @@ move var@13
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> false ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> test1::One::One { 0 = 3: u64; } ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  set_discriminant(e0, 0);
+  set_discriminant(enum0, 0);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> false ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> test1::One::One { 0 = 3: u64; } ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
-- op:
-move var@12
 
 [Debug] 
 **About to evaluate statement**: [
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
+  set_discriminant(e0, 0)
 ]
 
 **Context**:
@@ -112609,33 +111271,24 @@ move var@12
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> test1::One::One { 0 = 3: u64; } ;
+  Some (e0) -> ⊥ : test1::EmptyEnum ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@17 := copy y
+  set_discriminant(enum0, 0);
+  return
 ]
 
 **Context**:
@@ -112645,292 +111298,221 @@ move var@12
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> test1::One::One { 0 = 3: u64; } ;
+  Some (e0) -> test1::EmptyEnum::Empty ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  set_discriminant(enum0, 0)
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> test1::One::One { 0 = 3: u64; } ;
+  Some (e0) -> test1::EmptyEnum::Empty ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> ⊥ : test1::Enum ;
 }
 
 
-- op:
-copy y
 
-[Debug] end borrow: 5:
-- original context:
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 23: u32 ;
+  Some (y) -> 44: u32 ;
+  Some (z) -> 67: u32 ;
+  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (s) -> test1::Sum::Right { 0 = true; } ;
+  Some (o) -> test1::One::One { 0 = 3: u64; } ;
+  Some (e0) -> test1::EmptyEnum::Empty ;
+  Some (e1) -> ⊥ : test1::EmptyEnum ;
+  Some (enum0) -> test1::Enum::Variant1 ;
 }
 
-[Debug] end borrow: 5: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 6))
-[Debug] end borrow: 6:
-- original context:
+
+
+[Debug] test_function_symbolic: get_max
+[Debug] 
+**About to evaluate statement**: [
+  var@4 := copy x;
+  var@5 := copy y;
+  var@3 := move var@4 >= move var@5;
+  if (move var@3) {
+    var@0 := copy x
+  }
+  else {
+    var@0 := copy y
+  };
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> &mut@6 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
-[Debug] give_back:
-- bid: 6
-- content: &mut@6 (3: i32)
-- context:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  var@4 := copy x
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 6
-- value: 3: i32
-- context:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
-[Debug] end borrow: 5:
-- original context:
+- op:
+copy x
+
+[Debug] 
+**About to evaluate statement**: [
+  var@5 := copy y;
+  var@3 := move var@4 >= move var@5;
+  if (move var@3) {
+    var@0 := copy x
+  }
+  else {
+    var@0 := copy y
+  };
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (3: i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
-[Debug] give_back:
-- bid: 5
-- content: &mut@5 (3: i32)
-- context:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  var@5 := copy y
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 5
-- value: 3: i32
-- context:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
+- op:
+copy y
+
 [Debug] 
 **About to evaluate statement**: [
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@3 := move var@4 >= move var@5;
+  if (move var@3) {
+    var@0 := copy x
+  }
+  else {
+    var@0 := copy y
+  };
   return
 ]
 
@@ -112940,34 +111522,19 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> 3: i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@16 := move var@17 == 3: i32
+  var@3 := move var@4 >= move var@5
 ]
 
 **Context**:
@@ -112976,27 +111543,12 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> 3: i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
 }
 
 
@@ -113008,32 +111560,17 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> 3: i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
 }
 
 
 - op:
-move var@17
+move var@4
 
 [Debug] eval_operand:
 - ctx:
@@ -113042,37 +111579,26 @@ move var@17
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> s@1 : u32 ;
 }
 
 
 - op:
-3: i32
+move var@5
 
 [Debug] 
 **About to evaluate statement**: [
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  if (move var@3) {
+    var@0 := copy x
+  }
+  else {
+    var@0 := copy y
+  };
   return
 ]
 
@@ -113082,34 +111608,24 @@ move var@17
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> true ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@2 : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@15 := ¬ move var@16
+  if (move var@3) {
+    var@0 := copy x
+  }
+  else {
+    var@0 := copy y
+  }
 ]
 
 **Context**:
@@ -113118,27 +111634,12 @@ move var@17
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> true ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> s@2 : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
@@ -113150,37 +111651,21 @@ move var@17
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> true ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> true ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@16
+move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@15);
-  return
+  var@0 := copy x
 ]
 
 **Context**:
@@ -113189,66 +111674,34 @@ move var@16
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> false ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@15)
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> false ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
+- op:
+copy x
 
 [Debug] eval_operand:
 - ctx:
@@ -113257,36 +111710,21 @@ move var@16
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> false ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> false ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@15
+move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  return
+  var@0 := copy y
 ]
 
 **Context**:
@@ -113295,81 +111733,38 @@ move var@15
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 3: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] test_unit_function: id_mut_mut_test3
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: i32;
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
+- op:
+copy y
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32
+  return
 ]
 
 **Context**:
@@ -113378,69 +111773,49 @@ move var@15
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@0) -> s@0 : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@0) -> s@1 : u32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
 }
 
 
-- op:
-0: i32
 
+[Debug] test_function_symbolic: test3
 [Debug] 
 **About to evaluate statement**: [
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  x := move get_max(4: u32, 3: u32);
+  y := move get_max(10: u32, 11: u32);
+  var@4 := copy x;
+  var@5 := copy y;
+  z := copy var@4 + copy var@5;
+  var@9 := copy z;
+  var@8 := move var@9 == 15: u32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
   return
 ]
 
@@ -113451,26 +111826,22 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> ⊥ : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  px := &mut x
+  x := move get_max(4: u32, 3: u32)
 ]
 
 **Context**:
@@ -113480,70 +111851,76 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> ⊥ : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
-]
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
 
-**Context**:
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⊥ : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : u32 ;
+}
+
+
+- op:
+4: u32
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> ⊥ : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
+- op:
+3: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  ppx := &mut px
+  y := move get_max(10: u32, 11: u32);
+  var@4 := copy x;
+  var@5 := copy y;
+  z := copy var@4 + copy var@5;
+  var@9 := copy z;
+  var@8 := move var@9 == 15: u32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  return
 ]
 
 **Context**:
@@ -113553,40 +111930,22 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
+  y := move get_max(10: u32, 11: u32)
 ]
 
 **Context**:
@@ -113596,67 +111955,74 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := &two-phase *(ppx)
-]
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
 
-**Context**:
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : u32 ;
+}
+
+
+- op:
+10: u32
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> ⊥ : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
+- op:
+11: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@4 := copy x;
+  var@5 := copy y;
+  z := copy var@4 + copy var@5;
+  var@9 := copy z;
+  var@8 := move var@9 == 15: u32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
   return
 ]
 
@@ -113667,26 +112033,22 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5)
+  var@4 := copy x
 ]
 
 **Context**:
@@ -113696,25 +112058,19 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] activate_inactivated_mut_borrow: resulting value:
-&mut@0 (0: i32)
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -113723,285 +112079,207 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@5
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := &mut *(x);
-  var@0 := &mut *(var@2);
+  var@5 := copy y;
+  z := copy var@4 + copy var@5;
+  var@9 := copy z;
+  var@8 := move var@9 == 15: u32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
   return
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := &mut *(x)
+  var@5 := copy y
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (&mut@0 (0: i32)) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
+- op:
+copy y
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := &mut *(var@2)
+  z := copy var@4 + copy var@5;
+  var@9 := copy z;
+  var@8 := move var@9 == 15: u32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  return
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (&mut@0 (0: i32)) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  return
+  z := copy var@4 + copy var@5
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] ctx_pop_frame:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
-# Frame 1:
-{
-  Some (var@0) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (⌊mut@4⌋) ;
-}
+
+- op:
+copy var@4
 
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> ⊥ : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (x) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@2) -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@0
+copy var@5
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@9 := copy z;
+  var@8 := move var@9 == 15: u32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
   return
 ]
 
@@ -114012,29 +112290,22 @@ move var@0
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppy)) := 1: i32
+  var@9 := copy z
 ]
 
 **Context**:
@@ -114044,22 +112315,15 @@ move var@0
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
@@ -114072,41 +112336,26 @@ move var@0
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (0: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 - op:
-1: i32
+copy z
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@8 := move var@9 == 15: u32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
   return
 ]
 
@@ -114117,29 +112366,22 @@ move var@0
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> s@2 : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := &two-phase *(ppy)
+  var@8 := move var@9 == 15: u32
 ]
 
 **Context**:
@@ -114149,38 +112391,69 @@ move var@0
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> s@2 : u32 ;
+}
+
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> s@2 : u32 ;
+}
+
+
+- op:
+move var@9
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
+- op:
+15: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
   return
 ]
 
@@ -114191,29 +112464,22 @@ move var@0
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (@shared_loan({5}, &mut@0 (1: i32))) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⌊inactivated_mut@5⌋ ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@3 : bool ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppz := move id_mut_mut<i32>(move var@7)
+  var@7 := ¬ move var@8
 ]
 
 **Context**:
@@ -114223,28 +112489,19 @@ move var@0
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (@shared_loan({5}, &mut@0 (1: i32))) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⌊inactivated_mut@5⌋ ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@3 : bool ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] activate_inactivated_mut_borrow: resulting value:
-&mut@0 (1: i32)
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -114253,306 +112510,259 @@ move var@0
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> &mut@5 (&mut@0 (1: i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@3 : bool ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@7
+move var@8
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := &mut *(x);
-  var@0 := &mut *(var@2);
+  assert(¬move var@7);
   return
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> s@4 : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-}
-
-# Frame 1:
-{
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@5 (&mut@0 (1: i32)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := &mut *(x)
+  assert(¬move var@7)
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> s@4 : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
-# Frame 1:
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
 {
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@5 (&mut@0 (1: i32)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> true ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
 
+- op:
+move var@7
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := &mut *(var@2);
   return
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> s@0 : u32 ;
+  Some (y) -> s@1 : u32 ;
+  Some (z) -> s@2 : u32 ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (var@5) -> s@1 : u32 ;
+  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@9) -> ⊥ : u32 ;
 }
 
-# Frame 1:
+
+
+[Debug] test_function_symbolic: test_neg
+[Debug] 
+**About to evaluate statement**: [
+  var@2 := copy x;
+  var@3 := copy var@2 == -2147483648: i32;
+  assert(¬move var@3);
+  var@0 := - move var@2;
+  return
+]
+
+**Context**:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
 {
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@2) -> &mut@6 (&mut@0 (1: i32)) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> ⊥ : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := &mut *(var@2)
+  var@2 := copy x
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> ⊥ : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
-# Frame 1:
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
 {
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (x) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@2) -> &mut@6 (&mut@0 (1: i32)) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> ⊥ : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
 
+- op:
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
+  var@3 := copy var@2 == -2147483648: i32;
+  assert(¬move var@3);
+  var@0 := - move var@2;
   return
 ]
 
 **Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
-# Frame 1:
-{
-  Some (var@0) -> &mut@7 (&mut@0 (1: i32)) ;
-  Some (x) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@2) -> &mut@6 (⌊mut@7⌋) ;
-}
 
 
+[Debug] 
+**About to evaluate statement**: [
+  var@3 := copy var@2 == -2147483648: i32
+]
 
-[Debug] ctx_pop_frame:
+**Context**:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
-# Frame 1:
-{
-  Some (var@0) -> &mut@7 (&mut@0 (1: i32)) ;
-  Some (x) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@2) -> &mut@6 (⌊mut@7⌋) ;
-}
+
 
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
-# 2 frame(s)
+# 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
-# Frame 1:
+
+- op:
+copy var@2
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
 {
-  Some (var@0) -> &mut@7 (&mut@0 (1: i32)) ;
-  Some (x) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@2) -> &mut@6 (⌊mut@7⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
 
 - op:
-move var@0
+-2147483648: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  assert(¬move var@3);
+  var@0 := - move var@2;
   return
 ]
 
@@ -114562,33 +112772,17 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (1: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> s@1 : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppz)) := 2: i32
+  assert(¬move var@3)
 ]
 
 **Context**:
@@ -114597,26 +112791,10 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (1: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> s@1 : bool ;
 }
 
 
@@ -114628,42 +112806,19 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (1: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> true ;
 }
 
 
 - op:
-2: i32
+move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@0 := - move var@2;
   return
 ]
 
@@ -114673,33 +112828,17 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@10 := copy *(px)
+  var@0 := - move var@2
 ]
 
 **Context**:
@@ -114708,26 +112847,10 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
 
@@ -114739,400 +112862,297 @@ move var@0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (var@0) -> ⊥ : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> s@0 : i32 ;
+  Some (var@3) -> ⊥ : bool ;
 }
 
 
 - op:
-copy *(px)
+move var@2
 
-[Debug] end borrow: 1:
-- original context:
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> s@2 : i32 ;
+  Some (x) -> s@0 : i32 ;
+  Some (var@2) -> ⊥ : i32 ;
+  Some (var@3) -> ⊥ : bool ;
+}
+
+
+
+[Debug] test_function_symbolic: test_neg1
+[Debug] 
+**About to evaluate statement**: [
+  x := 3: i32;
+  y := -3: i32;
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (y) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 2))
-[Debug] end borrow: 2:
-- original context:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  x := 3: i32
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (y) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 2: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 3))
-[Debug] end borrow: 3:
-- original context:
+
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (y) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 3: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 4))
-[Debug] end borrow: 4:
-- original context:
+
+- op:
+3: i32
+
+[Debug] 
+**About to evaluate statement**: [
+  y := -3: i32;
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> 3: i32 ;
+  Some (y) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 4: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 5))
-[Debug] end borrow: 5:
-- original context:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  y := -3: i32
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> 3: i32 ;
+  Some (y) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 5: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 6))
-[Debug] end borrow: 6:
-- original context:
+
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> 3: i32 ;
+  Some (y) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 6: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 7))
-[Debug] end borrow: 7:
-- original context:
+
+- op:
+-3: i32
+
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@7 (&mut@0 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> 3: i32 ;
+  Some (y) -> -3: i32 ;
 }
 
-[Debug] give_back:
-- bid: 7
-- content: &mut@7 (&mut@0 (2: i32))
-- context:
+
+
+[Debug] test_function_symbolic: refs_test1
+[Debug] 
+**About to evaluate statement**: [
+  x := 0: i32;
+  px := &mut x;
+  ppx := &mut px;
+  *(*(ppx)) := 1: i32;
+  var@6 := copy x;
+  var@5 := move var@6 == 1: i32;
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 7
-- value: &mut@0 (2: i32)
-- context:
+
+[Debug] 
+**About to evaluate statement**: [
+  x := 0: i32
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (⌊mut@7⌋) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] end borrow: 6:
-- original context:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> &mut@6 (&mut@0 (2: i32)) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
-[Debug] give_back:
-- bid: 6
-- content: &mut@6 (&mut@0 (2: i32))
-- context:
+
+- op:
+0: i32
+
+[Debug] 
+**About to evaluate statement**: [
+  px := &mut x;
+  ppx := &mut px;
+  *(*(ppx)) := 1: i32;
+  var@6 := copy x;
+  var@5 := move var@6 == 1: i32;
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 0: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 6
-- value: &mut@0 (2: i32)
-- context:
+
+[Debug] 
+**About to evaluate statement**: [
+  px := &mut x
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (⌊mut@6⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> 0: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] end borrow: 5:
-- original context:
+
+[Debug] 
+**About to evaluate statement**: [
+  ppx := &mut px;
+  *(*(ppx)) := 1: i32;
+  var@6 := copy x;
+  var@5 := move var@6 == 1: i32;
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115140,30 +113160,21 @@ copy *(px)
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@5 (&mut@0 (2: i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (px) -> &mut@0 (0: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
-[Debug] give_back:
-- bid: 5
-- content: &mut@5 (&mut@0 (2: i32))
-- context:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  ppx := &mut px
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115171,31 +113182,26 @@ copy *(px)
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (px) -> &mut@0 (0: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 5
-- value: &mut@0 (2: i32)
-- context:
+
+[Debug] 
+**About to evaluate statement**: [
+  *(*(ppx)) := 1: i32;
+  var@6 := copy x;
+  var@5 := move var@6 == 1: i32;
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115204,28 +113210,20 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] end borrow: 4:
-- original context:
+
+[Debug] 
+**About to evaluate statement**: [
+  *(*(ppx)) := 1: i32
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115234,29 +113232,16 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@4 (&mut@0 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
-[Debug] give_back:
-- bid: 4
-- content: &mut@4 (&mut@0 (2: i32))
-- context:
+
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115265,30 +113250,26 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 4
-- value: &mut@0 (2: i32)
-- context:
+- op:
+1: i32
+
+[Debug] 
+**About to evaluate statement**: [
+  var@6 := copy x;
+  var@5 := move var@6 == 1: i32;
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115297,28 +113278,20 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (⌊mut@4⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] end borrow: 3:
-- original context:
+
+[Debug] 
+**About to evaluate statement**: [
+  var@6 := copy x
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115327,29 +113300,16 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> &mut@3 (&mut@0 (2: i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
-[Debug] give_back:
-- bid: 3
-- content: &mut@3 (&mut@0 (2: i32))
-- context:
+
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115358,30 +113318,18 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 3
-- value: &mut@0 (2: i32)
-- context:
+- op:
+copy x
+
+[Debug] end borrow: 0:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -115390,27 +113338,14 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (⌊mut@3⌋) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
-
-[Debug] end borrow: 2:
+[Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.OuterBorrows (InterpreterBorrowsCore.Borrow 1))
+[Debug] end borrow: 1:
 - original context:
 # Ended regions: {}
 # 1 frame(s)
@@ -115420,28 +113355,15 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> &mut@2 (&mut@0 (2: i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 [Debug] give_back:
-- bid: 2
-- content: &mut@2 (&mut@0 (2: i32))
+- bid: 1
+- content: &mut@1 (&mut@0 (1: i32))
 - context:
 # Ended regions: {}
 # 1 frame(s)
@@ -115451,29 +113373,16 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 [Debug] give_back_value:
-- bid: 2
-- value: &mut@0 (2: i32)
+- bid: 1
+- value: &mut@0 (1: i32)
 - context:
 # Ended regions: {}
 # 1 frame(s)
@@ -115483,27 +113392,14 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
-[Debug] end borrow: 1:
+[Debug] end borrow: 0:
 - original context:
 # Ended regions: {}
 # 1 frame(s)
@@ -115512,29 +113408,16 @@ copy *(px)
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (2: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (px) -> &mut@0 (1: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 [Debug] give_back:
-- bid: 1
-- content: &mut@1 (&mut@0 (2: i32))
+- bid: 0
+- content: &mut@0 (1: i32)
 - context:
 # Ended regions: {}
 # 1 frame(s)
@@ -115543,30 +113426,17 @@ copy *(px)
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 [Debug] give_back_value:
-- bid: 1
-- value: &mut@0 (2: i32)
+- bid: 0
+- value: 1: i32
 - context:
 # Ended regions: {}
 # 1 frame(s)
@@ -115575,36 +113445,19 @@ copy *(px)
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@5 := move var@6 == 1: i32;
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
   return
 ]
 
@@ -115615,32 +113468,19 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> 2: i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> 1: i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := move var@10 == 2: i32
+  var@5 := move var@6 == 1: i32
 ]
 
 **Context**:
@@ -115650,25 +113490,12 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> 2: i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> 1: i32 ;
 }
 
 
@@ -115681,30 +113508,17 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> 2: i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> 1: i32 ;
 }
 
 
 - op:
-move var@10
+move var@6
 
 [Debug] eval_operand:
 - ctx:
@@ -115714,39 +113528,22 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 - op:
-2: i32
+1: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
   return
 ]
 
@@ -115757,32 +113554,19 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> true ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> s@0 : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := ¬ move var@9
+  var@4 := ¬ move var@5
 ]
 
 **Context**:
@@ -115792,25 +113576,12 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> true ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> s@0 : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
@@ -115823,38 +113594,21 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> true ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> s@0 : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@9
+move var@5
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  assert(¬move var@4);
   return
 ]
 
@@ -115865,32 +113619,19 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> s@1 : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@8)
+  assert(¬move var@4)
 ]
 
 **Context**:
@@ -115900,25 +113641,12 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> s@1 : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
@@ -115931,37 +113659,20 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> true ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@8
+move var@4
 
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
   return
 ]
 
@@ -115972,32 +113683,44 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> 1: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : i32 ;
 }
 
 
 
+[Debug] test_function_symbolic: refs_test2
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := copy x
+  x := 0: i32;
+  y := 1: i32;
+  px := &mut x;
+  py := &mut y;
+  ppx := &mut px;
+  var@6 := &mut *(py);
+  *(ppx) := move var@6;
+  *(*(ppx)) := 2: i32;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
 ]
 
 **Context**:
@@ -116007,160 +113730,119 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (y) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  x := 0: i32
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (y) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-copy x
-
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
 
-[Debug] give_back:
-- bid: 0
-- content: &mut@0 (2: i32)
-- context:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
+  Some (x) -> ⊥ : i32 ;
+  Some (y) -> ⊥ : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 0
-- value: 2: i32
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-}
-
+- op:
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  y := 1: i32;
+  px := &mut x;
+  py := &mut y;
+  ppx := &mut px;
+  var@6 := &mut *(py);
+  *(ppx) := move var@6;
+  *(*(ppx)) := 2: i32;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -116171,32 +113853,31 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⊥ : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> 2: i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := move var@13 == 2: i32
+  y := 1: i32
 ]
 
 **Context**:
@@ -116206,25 +113887,24 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⊥ : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> 2: i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -116237,69 +113917,89 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⊥ : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> 2: i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@13
+1: i32
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  px := &mut x;
+  py := &mut y;
+  ppx := &mut px;
+  var@6 := &mut *(py);
+  *(ppx) := move var@6;
+  *(*(ppx)) := 2: i32;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 1: i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-2: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
+  px := &mut x
 ]
 
 **Context**:
@@ -116309,32 +114009,52 @@ move var@13
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 1: i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> true ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@11 := ¬ move var@12
+  py := &mut y;
+  ppx := &mut px;
+  var@6 := &mut *(py);
+  *(ppx) := move var@6;
+  *(*(ppx)) := 2: i32;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
 ]
 
 **Context**:
@@ -116344,65 +114064,84 @@ move var@13
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> 1: i32 ;
+  Some (px) -> &mut@0 (0: i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> true ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  py := &mut y
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> 1: i32 ;
+  Some (px) -> &mut@0 (0: i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> true ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-move var@12
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@11);
+  ppx := &mut px;
+  var@6 := &mut *(py);
+  *(ppx) := move var@6;
+  *(*(ppx)) := 2: i32;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -116413,32 +114152,31 @@ move var@12
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@0 (0: i32) ;
+  Some (py) -> &mut@1 (1: i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> false ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@11)
+  ppx := &mut px
 ]
 
 **Context**:
@@ -116448,65 +114186,84 @@ move var@12
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@0 (0: i32) ;
+  Some (py) -> &mut@1 (1: i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> false ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@6 := &mut *(py);
+  *(ppx) := move var@6;
+  *(*(ppx)) := 2: i32;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (1: i32) ;
+  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> false ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-move var@11
 
 [Debug] 
 **About to evaluate statement**: [
-  return
+  var@6 := &mut *(py)
 ]
 
 **Context**:
@@ -116516,35 +114273,48 @@ move var@11
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (1: i32) ;
+  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  None -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] test_function_symbolic: add_test
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy x;
-  var@4 := copy y;
-  var@0 := copy var@3 + copy var@4;
+  *(ppx) := move var@6;
+  *(*(ppx)) := 2: i32;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -116554,19 +114324,32 @@ move var@11
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
+  Some (var@6) -> &mut@3 (1: i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy x
+  *(ppx) := move var@6
 ]
 
 **Context**:
@@ -116575,12 +114358,25 @@ move var@11
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
+  Some (var@6) -> &mut@3 (1: i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -116592,84 +114388,146 @@ move var@11
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
+  Some (var@6) -> &mut@3 (1: i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := copy y;
-  var@0 := copy var@3 + copy var@4;
-  return
-]
+move var@6
 
-**Context**:
+[Debug] end borrow: 0:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (⊥ : &'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  None -> &mut@3 (1: i32) ;
+  None -> &mut@0 (0: i32) ;
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := copy y
-]
-
-**Context**:
+[Debug] give_back:
+- bid: 0
+- content: &mut@0 (0: i32)
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (⊥ : &'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  None -> &mut@3 (1: i32) ;
+  None -> ⊥ : &'_ mut (i32) ;
 }
 
 
-
-[Debug] eval_operand:
-- ctx:
+[Debug] give_back_value:
+- bid: 0
+- value: 0: i32
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (⊥ : &'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  None -> &mut@3 (1: i32) ;
+  None -> ⊥ : &'_ mut (i32) ;
 }
 
 
-- op:
-copy y
-
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := copy var@3 + copy var@4;
+  *(*(ppx)) := 2: i32;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -116679,19 +114537,32 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@3 (1: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := copy var@3 + copy var@4
+  *(*(ppx)) := 2: i32
 ]
 
 **Context**:
@@ -116700,34 +114571,28 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@3 (1: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-copy var@3
 
 [Debug] eval_operand:
 - ctx:
@@ -116736,45 +114601,49 @@ copy var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@3 (1: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy var@4
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> s@2 : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
-}
-
-
+2: i32
 
-[Debug] test_function_symbolic: subs_test
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy x;
-  var@4 := copy y;
-  var@0 := copy var@3 - copy var@4;
+  var@9 := copy *(px);
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -116784,19 +114653,32 @@ copy var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@3 (2: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy x
+  var@9 := copy *(px)
 ]
 
 **Context**:
@@ -116805,12 +114687,25 @@ copy var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@3 (2: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -116822,84 +114717,138 @@ copy var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@3 (2: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := copy y;
-  var@0 := copy var@3 - copy var@4;
-  return
-]
+copy *(px)
 
-**Context**:
+[Debug] end borrow: 2:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> &mut@2 (&mut@3 (2: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := copy y
-]
-
-**Context**:
+[Debug] give_back:
+- bid: 2
+- content: &mut@2 (&mut@3 (2: i32))
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+[Debug] give_back_value:
+- bid: 2
+- value: &mut@3 (2: i32)
+- context:
+# Ended regions: {}
+# 1 frame(s)
+
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⌊mut@2⌋ ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-copy y
-
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := copy var@3 - copy var@4;
+  var@8 := move var@9 == 2: i32;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -116909,19 +114858,32 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> 2: i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := copy var@3 - copy var@4
+  var@8 := move var@9 == 2: i32
 ]
 
 **Context**:
@@ -116930,12 +114892,25 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> 2: i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -116947,17 +114922,30 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> 2: i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy var@3
+move var@9
 
 [Debug] eval_operand:
 - ctx:
@@ -116966,45 +114954,47 @@ copy var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy var@4
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> s@2 : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : (u32, bool) ;
-}
-
-
+2: i32
 
-[Debug] test_function_symbolic: div_test
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy x;
-  var@4 := copy y;
-  var@0 := move var@3 / move var@4;
+  var@7 := ¬ move var@8;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117014,19 +115004,32 @@ copy var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@0 : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy x
+  var@7 := ¬ move var@8
 ]
 
 **Context**:
@@ -117035,12 +115038,25 @@ copy var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@0 : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -117052,22 +115068,46 @@ copy var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@0 : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy x
+move var@8
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy y;
-  var@0 := move var@3 / move var@4;
+  assert(¬move var@7);
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117077,19 +115117,32 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> s@1 : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy y
+  assert(¬move var@7)
 ]
 
 **Context**:
@@ -117098,12 +115151,25 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> s@1 : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -117115,21 +115181,45 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> true ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy y
+move var@7
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := move var@3 / move var@4;
+  var@12 := copy x;
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117139,19 +115229,32 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := move var@3 / move var@4
+  var@12 := copy x
 ]
 
 **Context**:
@@ -117160,34 +115263,28 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : bool ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-move var@3
 
 [Debug] eval_operand:
 - ctx:
@@ -117196,20 +115293,44 @@ move var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@4
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
+  var@11 := move var@12 == 0: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117219,23 +115340,32 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> s@2 : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> 0: i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] test_function_symbolic: rem_test
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy x;
-  var@4 := copy y;
-  var@0 := move var@3 % move var@4;
-  return
+  var@11 := move var@12 == 0: i32
 ]
 
 **Context**:
@@ -117244,36 +115374,60 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> 0: i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@3 := copy x
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> 0: i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
+- op:
+move var@12
 
 [Debug] eval_operand:
 - ctx:
@@ -117282,22 +115436,43 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy x
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy y;
-  var@0 := move var@3 % move var@4;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117307,19 +115482,32 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@2 : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy y
+  var@10 := ¬ move var@11
 ]
 
 **Context**:
@@ -117328,12 +115516,25 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@2 : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -117345,21 +115546,42 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@2 : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy y
+move var@11
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := move var@3 % move var@4;
+  assert(¬move var@10);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117369,19 +115591,32 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> s@3 : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := move var@3 % move var@4
+  assert(¬move var@10)
 ]
 
 **Context**:
@@ -117390,34 +115625,28 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : bool ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@0 : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> s@3 : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-move var@3
 
 [Debug] eval_operand:
 - ctx:
@@ -117426,54 +115655,41 @@ move var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> s@1 : u32 ;
-  Some (var@5) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> true ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@4
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> s@2 : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : bool ;
-}
-
-
+move var@10
 
-[Debug] test_function_symbolic: test2
 [Debug] 
 **About to evaluate statement**: [
-  x := 23: u32;
-  y := 44: u32;
-  z := 67: u32;
-  var@5 := copy x;
-  (p).x := move var@5;
-  (p).y := 67: u32;
-  (s as test1::Sum::Right).0 := true;
-  set_discriminant(s, 1);
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
+  var@15 := copy *(py);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117484,23 +115700,31 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 23: u32
+  var@15 := copy *(py)
 ]
 
 **Context**:
@@ -117510,16 +115734,24 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -117532,121 +115764,129 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-23: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  y := 44: u32;
-  z := 67: u32;
-  var@5 := copy x;
-  (p).x := move var@5;
-  (p).y := 67: u32;
-  (s as test1::Sum::Right).0 := true;
-  set_discriminant(s, 1);
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
-  return
-]
+copy *(py)
 
-**Context**:
+[Debug] end borrow: 3:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> &mut@3 (2: i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  y := 44: u32
-]
-
-**Context**:
+[Debug] give_back:
+- bid: 3
+- content: &mut@3 (2: i32)
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-
-[Debug] eval_operand:
-- ctx:
+[Debug] give_back_value:
+- bid: 3
+- value: 2: i32
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (⌊mut@3⌋) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-44: u32
-
 [Debug] 
 **About to evaluate statement**: [
-  z := 67: u32;
-  var@5 := copy x;
-  (p).x := move var@5;
-  (p).y := 67: u32;
-  (s as test1::Sum::Right).0 := true;
-  set_discriminant(s, 1);
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
+  var@14 := move var@15 == 2: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117657,23 +115897,31 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> 2: i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  z := 67: u32
+  var@14 := move var@15 == 2: i32
 ]
 
 **Context**:
@@ -117683,16 +115931,24 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> 2: i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -117705,33 +115961,70 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> 2: i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-67: u32
+move var@15
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+- op:
+2: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := copy x;
-  (p).x := move var@5;
-  (p).y := 67: u32;
-  (s as test1::Sum::Right).0 := true;
-  set_discriminant(s, 1);
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117742,23 +116035,31 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> s@4 : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := copy x
+  var@13 := ¬ move var@14
 ]
 
 **Context**:
@@ -117768,16 +116069,24 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> s@4 : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -117790,32 +116099,37 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> s@4 : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy x
+move var@14
 
 [Debug] 
 **About to evaluate statement**: [
-  (p).x := move var@5;
-  (p).y := 67: u32;
-  (s as test1::Sum::Right).0 := true;
-  set_discriminant(s, 1);
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117826,23 +116140,31 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> 23: u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> s@5 : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (p).x := move var@5
+  assert(¬move var@13)
 ]
 
 **Context**:
@@ -117852,16 +116174,24 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> 23: u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> s@5 : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -117874,35 +116204,36 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> ⊥ : test1::Pair<u32, u32> ;
-  Some (var@5) -> 23: u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> true ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@5
+move var@13
 
-[Debug] expand_bottom_value_from_projection:
-pe: (Expressions.Field ((Expressions.ProjAdt (0, None)), 0))
-ty: (Types.Adt ((Types.AdtId 0), [],
-   [(Types.Integer Types.U32); (Types.Integer Types.U32)]))
 [Debug] 
 **About to evaluate statement**: [
-  (p).y := 67: u32;
-  (s as test1::Sum::Right).0 := true;
-  set_discriminant(s, 1);
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
+  var@18 := copy y;
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117913,23 +116244,31 @@ ty: (Types.Adt ((Types.AdtId 0), [],
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = ⊥ : u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (p).y := 67: u32
+  var@18 := copy y
 ]
 
 **Context**:
@@ -117939,16 +116278,24 @@ ty: (Types.Adt ((Types.AdtId 0), [],
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = ⊥ : u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -117961,30 +116308,125 @@ ty: (Types.Adt ((Types.AdtId 0), [],
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = ⊥ : u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-67: u32
+copy y
+
+[Debug] end borrow: 1:
+- original context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> &mut@1 (2: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+[Debug] give_back:
+- bid: 1
+- content: &mut@1 (2: i32)
+- context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+[Debug] give_back_value:
+- bid: 1
+- value: 2: i32
+- context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> ⌊mut@1⌋ ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
 
 [Debug] 
 **About to evaluate statement**: [
-  (s as test1::Sum::Right).0 := true;
-  set_discriminant(s, 1);
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
+  var@17 := move var@18 == 2: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -117995,23 +116437,31 @@ ty: (Types.Adt ((Types.AdtId 0), [],
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> 2: i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (s as test1::Sum::Right).0 := true
+  var@17 := move var@18 == 2: i32
 ]
 
 **Context**:
@@ -118021,16 +116471,24 @@ ty: (Types.Adt ((Types.AdtId 0), [],
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> 2: i32 ;
 }
 
 
@@ -118043,32 +116501,66 @@ ty: (Types.Adt ((Types.AdtId 0), [],
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> ⊥ : test1::Sum<u32, bool> ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> 2: i32 ;
 }
 
 
 - op:
-true
+move var@18
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+- op:
+2: i32
 
-[Debug] expand_bottom_value_from_projection:
-pe: (Expressions.Field ((Expressions.ProjAdt (6, (Some 1))), 0))
-ty: (Types.Adt ((Types.AdtId 6), [], [(Types.Integer Types.U32); Types.Bool]))
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(s, 1);
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -118079,23 +116571,31 @@ ty: (Types.Adt ((Types.AdtId 6), [], [(Types.Integer Types.U32); Types.Bool]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> s@6 : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(s, 1)
+  var@16 := ¬ move var@17
 ]
 
 **Context**:
@@ -118105,26 +116605,63 @@ ty: (Types.Adt ((Types.AdtId 6), [], [(Types.Integer Types.U32); Types.Bool]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> s@6 : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> s@6 : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
+- op:
+move var@17
 
 [Debug] 
 **About to evaluate statement**: [
-  (o as test1::One::One).0 := 3: u64;
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
+  assert(¬move var@16);
   return
 ]
 
@@ -118135,23 +116672,31 @@ ty: (Types.Adt ((Types.AdtId 6), [], [(Types.Integer Types.U32); Types.Bool]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> s@7 : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (o as test1::One::One).0 := 3: u64
+  assert(¬move var@16)
 ]
 
 **Context**:
@@ -118161,16 +116706,24 @@ ty: (Types.Adt ((Types.AdtId 6), [], [(Types.Integer Types.U32); Types.Bool]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> s@7 : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -118183,30 +116736,32 @@ ty: (Types.Adt ((Types.AdtId 6), [], [(Types.Integer Types.U32); Types.Bool]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> ⊥ : test1::One<u64> ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> true ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-3: u64
+move var@16
 
-[Debug] expand_bottom_value_from_projection:
-pe: (Expressions.Field ((Expressions.ProjAdt (2, (Some 0))), 0))
-ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(o, 0);
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
   return
 ]
 
@@ -118217,23 +116772,38 @@ ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> test1::One::One { 0 = 3: u64; } ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 2: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (py) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
+[Debug] test_function_symbolic: test_list1
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(o, 0)
+  set_discriminant(var@3, 1);
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  drop(l);
+  return
 ]
 
 **Context**:
@@ -118243,25 +116813,16 @@ ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> test1::One::One { 0 = 3: u64; } ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(e0, 0);
-  set_discriminant(enum0, 0);
-  return
+  set_discriminant(var@3, 1)
 ]
 
 **Context**:
@@ -118271,23 +116832,21 @@ ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> test1::One::One { 0 = 3: u64; } ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(e0, 0)
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  drop(l);
+  return
 ]
 
 **Context**:
@@ -118297,24 +116856,16 @@ ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> test1::One::One { 0 = 3: u64; } ;
-  Some (e0) -> ⊥ : test1::EmptyEnum ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> test1::List::Nil ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(enum0, 0);
-  return
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3)
 ]
 
 **Context**:
@@ -118324,84 +116875,41 @@ ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> test1::One::One { 0 = 3: u64; } ;
-  Some (e0) -> test1::EmptyEnum::Empty ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  set_discriminant(enum0, 0)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> test1::One::One { 0 = 3: u64; } ;
-  Some (e0) -> test1::EmptyEnum::Empty ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> ⊥ : test1::Enum ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> test1::List::Nil ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
+[Debug] eval_non_local_function_call:
+- fid:CfimAst.BoxNew
+- type_params: [test1::List<i32>]
+- args: [move var@3]
+- dest: var@2
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 23: u32 ;
-  Some (y) -> 44: u32 ;
-  Some (z) -> 67: u32 ;
-  Some (p) -> test1::Pair { x = 23: u32; y = 67: u32; } ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (s) -> test1::Sum::Right { 0 = true; } ;
-  Some (o) -> test1::One::One { 0 = 3: u64; } ;
-  Some (e0) -> test1::EmptyEnum::Empty ;
-  Some (e1) -> ⊥ : test1::EmptyEnum ;
-  Some (enum0) -> test1::Enum::Variant1 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> test1::List::Nil ;
 }
 
 
+- op:
+move var@3
 
-[Debug] test_function_symbolic: get_max
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy x;
-  var@5 := copy y;
-  var@3 := move var@4 >= move var@5;
-  if (move var@3) {
-    var@0 := copy x
-  }
-  else {
-    var@0 := copy y
-  };
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  drop(l);
   return
 ]
 
@@ -118411,19 +116919,17 @@ ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy x
+  (l as test1::List::Cons).0 := 0: i32
 ]
 
 **Context**:
@@ -118432,12 +116938,10 @@ ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
@@ -118449,28 +116953,24 @@ ty: (Types.Adt ((Types.AdtId 2), [], [(Types.Integer Types.U64)]))
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 - op:
-copy x
+0: i32
 
+[Debug] expand_bottom_value_from_projection:
+pe: (Expressions.Field ((Expressions.ProjAdt (1, (Some 0))), 0))
+ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := copy y;
-  var@3 := move var@4 >= move var@5;
-  if (move var@3) {
-    var@0 := copy x
-  }
-  else {
-    var@0 := copy y
-  };
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  drop(l);
   return
 ]
 
@@ -118480,19 +116980,17 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := copy y
+  (l as test1::List::Cons).1 := move var@2
 ]
 
 **Context**:
@@ -118501,12 +116999,10 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
@@ -118518,27 +117014,20 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 - op:
-copy y
+move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := move var@4 >= move var@5;
-  if (move var@3) {
-    var@0 := copy x
-  }
-  else {
-    var@0 := copy y
-  };
+  set_discriminant(l, 0);
+  drop(l);
   return
 ]
 
@@ -118548,19 +117037,17 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := move var@4 >= move var@5
+  set_discriminant(l, 0)
 ]
 
 **Context**:
@@ -118569,62 +117056,17 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-}
-
-
-- op:
-move var@4
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> s@1 : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
-- op:
-move var@5
 
 [Debug] 
 **About to evaluate statement**: [
-  if (move var@3) {
-    var@0 := copy x
-  }
-  else {
-    var@0 := copy y
-  };
+  drop(l);
   return
 ]
 
@@ -118634,24 +117076,17 @@ move var@5
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@2 : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  if (move var@3) {
-    var@0 := copy x
-  }
-  else {
-    var@0 := copy y
-  }
+  drop(l)
 ]
 
 **Context**:
@@ -118660,38 +117095,18 @@ move var@5
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> s@2 : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> true ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
-- op:
-move var@3
 
+[Debug] drop_value: place: l
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := copy x
+  return
 ]
 
 **Context**:
@@ -118700,57 +117115,53 @@ move var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-}
-
-
-- op:
-copy x
+[Debug] test_function_symbolic: test_box1
+[Debug] 
+**About to evaluate statement**: [
+  b := move alloc::boxed::Box<i32>::new(0: i32);
+  var@3 := &two-phase b;
+  x := move core::ops::deref::DerefMut<i32>::deref_mut(move var@3);
+  *(x) := 1: i32;
+  var@5 := &b;
+  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
+  var@8 := copy *(x);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
+  return
+]
 
-[Debug] eval_operand:
-- ctx:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> false ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
-- op:
-move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := copy y
+  b := move alloc::boxed::Box<i32>::new(0: i32)
 ]
 
 **Context**:
@@ -118759,16 +117170,24 @@ move var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
+[Debug] eval_non_local_function_call:
+- fid:CfimAst.BoxNew
+- type_params: [i32]
+- args: [0: i32]
+- dest: b
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -118776,20 +117195,33 @@ move var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy y
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
+  var@3 := &two-phase b;
+  x := move core::ops::deref::DerefMut<i32>::deref_mut(move var@3);
+  *(x) := 1: i32;
+  var@5 := &b;
+  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
+  var@8 := copy *(x);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
@@ -118799,19 +117231,22 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> s@0 : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> s@0 : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  return
+  var@3 := &two-phase b
 ]
 
 **Context**:
@@ -118820,28 +117255,30 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> s@1 : u32 ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> s@0 : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] test_function_symbolic: test3
 [Debug] 
 **About to evaluate statement**: [
-  x := move get_max(4: u32, 3: u32);
-  y := move get_max(10: u32, 11: u32);
-  var@4 := copy x;
-  var@5 := copy y;
-  z := copy var@4 + copy var@5;
-  var@9 := copy z;
-  var@8 := move var@9 == 15: u32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
+  x := move core::ops::deref::DerefMut<i32>::deref_mut(move var@3);
+  *(x) := 1: i32;
+  var@5 := &b;
+  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
+  var@8 := copy *(x);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
@@ -118852,22 +117289,21 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({0}, s@0 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⌊inactivated_mut@0⌋ ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  x := move get_max(4: u32, 3: u32)
+  x := move core::ops::deref::DerefMut<i32>::deref_mut(move var@3)
 ]
 
 **Context**:
@@ -118877,42 +117313,25 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({0}, s@0 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⌊inactivated_mut@0⌋ ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
-- op:
-4: u32
 
+[Debug] eval_non_local_function_call:
+- fid:CfimAst.BoxDerefMut
+- type_params: [i32]
+- args: [move var@3]
+- dest: x
+[Debug] activate_inactivated_mut_borrow: resulting value:
+s@0 : std::boxed::Box<i32>
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -118921,31 +117340,30 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> &mut@0 (s@0 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 - op:
-3: u32
+move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  y := move get_max(10: u32, 11: u32);
-  var@4 := copy x;
-  var@5 := copy y;
-  z := copy var@4 + copy var@5;
-  var@9 := copy z;
-  var@8 := move var@9 == 15: u32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
+  *(x) := 1: i32;
+  var@5 := &b;
+  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
+  var@8 := copy *(x);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
@@ -118956,22 +117374,25 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> s@1 : &r@0 mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    proj_loans (s@1 : &r@0 mut (i32))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  y := move get_max(10: u32, 11: u32)
+  *(x) := 1: i32
 ]
 
 **Context**:
@@ -118981,15 +117402,18 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> s@1 : &r@0 mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    proj_loans (s@1 : &r@0 mut (i32))
+  }
 }
 
 
@@ -119002,53 +117426,81 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> s@1 : &r@0 mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    proj_loans (s@1 : &r@0 mut (i32))
+  }
 }
 
 
 - op:
-10: u32
+1: i32
 
-[Debug] eval_operand:
-- ctx:
+[Debug] expand_symbolic_value: s@1 : &r@0 mut (i32)
+
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> ⊥ : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> s@1 : &r@0 mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    proj_loans (s@1 : &r@0 mut (i32))
+  }
+  None -> 1: i32 ;
 }
 
 
-- op:
-11: u32
+- new context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> &mut@1 (s@2 : i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
+  None -> 1: i32 ;
+}
+
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy x;
-  var@5 := copy y;
-  z := copy var@4 + copy var@5;
-  var@9 := copy z;
-  var@8 := move var@9 == 15: u32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
+  var@5 := &b;
+  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
+  var@8 := copy *(x);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
@@ -119059,22 +117511,25 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> &mut@1 (1: i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy x
+  var@5 := &b
 ]
 
 **Context**:
@@ -119084,541 +117539,653 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> &mut@1 (1: i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] end borrow: 0:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> &mut@1 (1: i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
 }
 
-
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := copy y;
-  z := copy var@4 + copy var@5;
-  var@9 := copy z;
-  var@8 := move var@9 == 15: u32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  return
-]
-
-**Context**:
+[Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
+[Debug] end_abstraction: 0
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> &mut@1 (1: i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := copy y
-]
-
-**Context**:
+[Debug] end_abstraction: 0
+- context after parent abstractions ended:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> &mut@1 (1: i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
 }
 
-
-
-[Debug] eval_operand:
-- ctx:
+[Debug] end borrow: 1:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> &mut@1 (1: i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
 }
 
+[Debug] give_back:
+- bid: 1
+- content: &mut@1 (1: i32)
+- context:
+# Ended regions: {}
+# 1 frame(s)
 
-- op:
-copy y
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
+}
 
-[Debug] 
-**About to evaluate statement**: [
-  z := copy var@4 + copy var@5;
-  var@9 := copy z;
-  var@8 := move var@9 == 15: u32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  return
-]
 
-**Context**:
+[Debug] give_back_value:
+- bid: 1
+- value: 1: i32
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
 }
 
 
-
-[Debug] 
-**About to evaluate statement**: [
-  z := copy var@4 + copy var@5
-]
-
-**Context**:
+[Debug] end_abstraction: 0
+- context after loans ended:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }
+  }
 }
 
-
-
-[Debug] eval_operand:
-- ctx:
+[Debug] give_back_value:
+- bid: 0
+- value: s@3 : std::boxed::Box<i32>
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⊥ : &r@0 mut (std::boxed::Box<i32>),
+    @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }
+  }
 }
 
 
-- op:
-copy var@4
-
-[Debug] eval_operand:
-- ctx:
+[Debug] end_abstraction: 0
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> ⊥ : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> ⌊mut@0⌋ ;
+  Some (x) -> &mut@1 (1: i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
+    ⌊mut@1, proj_loans (s@2 : i32)⌋
+  }
 }
 
 
-- op:
-copy var@5
+- new context:
+# Ended regions: {0}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> s@3 : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+}
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := copy z;
-  var@8 := move var@9 == 15: u32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
+  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
+  var@8 := copy *(x);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⌊shared@2⌋ ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := copy z
+  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5)
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⌊shared@2⌋ ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
+[Debug] eval_non_local_function_call:
+- fid:CfimAst.BoxDeref
+- type_params: [i32]
+- args: [move var@5]
+- dest: x
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⌊shared@2⌋ ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy z
+move var@5
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := move var@9 == 15: u32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
+  var@8 := copy *(x);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> s@4 : &r@1 (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@2 : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    proj_loans (s@4 : &r@1 (i32))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := move var@9 == 15: u32
+  var@8 := copy *(x)
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> s@4 : &r@1 (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@2 : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    proj_loans (s@4 : &r@1 (i32))
+  }
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> s@4 : &r@1 (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@2 : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    proj_loans (s@4 : &r@1 (i32))
+  }
 }
 
 
 - op:
-move var@9
+copy *(x)
 
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
+[Debug] expand_symbolic_value: s@4 : &r@1 (i32)
+
+- original context:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> s@4 : &r@1 (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    proj_loans (s@4 : &r@1 (i32))
+  }
 }
 
 
-- op:
-15: u32
+- new context:
+# Ended regions: {0}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
+}
+
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@3 : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> s@5 : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := ¬ move var@8
+  var@7 := move var@8 == 1: i32
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@3 : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> s@5 : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@3 : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (var@8) -> s@5 : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 - op:
 move var@8
 
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {0}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
+}
+
+
+- op:
+1: i32
+
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@7);
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
-  Some (var@7) -> s@4 : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@6 : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@7)
+  var@6 := ¬ move var@7
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
-  Some (var@7) -> s@4 : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@6 : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
-  Some (var@7) -> true ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@6 : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
@@ -119627,224 +118194,358 @@ move var@7
 
 [Debug] 
 **About to evaluate statement**: [
+  assert(¬move var@6);
+  drop(b);
   return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (y) -> s@1 : u32 ;
-  Some (z) -> s@2 : u32 ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (var@5) -> s@1 : u32 ;
-  Some (var@6) -> ⊥ : (u32, bool) ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> s@7 : bool ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] test_function_symbolic: test_neg
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := copy x;
-  var@3 := copy var@2 == -2147483648: i32;
-  assert(¬move var@3);
-  var@0 := - move var@2;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> ⊥ : i32 ;
-  Some (var@3) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := copy x
+  assert(¬move var@6)
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> ⊥ : i32 ;
-  Some (var@3) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> s@7 : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> ⊥ : i32 ;
-  Some (var@3) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> true ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 - op:
-copy x
+move var@6
 
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy var@2 == -2147483648: i32;
-  assert(¬move var@3);
-  var@0 := - move var@2;
+  drop(b);
   return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := copy var@2 == -2147483648: i32
+  drop(b)
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
+[Debug] drop_value: place: b
+[Debug] end borrow: 2:
+- original context:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
+  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
 }
 
+[Debug] end borrow: 2: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 1)
+[Debug] end_abstraction: 1
+- original context:
+# Ended regions: {0}
+# 1 frame(s)
 
-- op:
-copy var@2
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
+  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+}
 
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
+[Debug] end_abstraction: 1
+- context after parent abstractions ended:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
+  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
 }
 
+[Debug] end borrow: 3:
+- original context:
+# Ended regions: {0}
+# 1 frame(s)
 
-- op:
--2147483648: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@3);
-  var@0 := - move var@2;
-  return
-]
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
+  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+}
 
-**Context**:
-# Ended regions: {}
+[Debug] give_back:
+- bid: 3
+- content: ⌊shared@3⌋
+- context:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> s@1 : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
+  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
 }
 
 
+[Debug] end_abstraction: 1
+- context after loans ended:
+# Ended regions: {0}
+# 1 frame(s)
 
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@3)
-]
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @ended_shared_loan(s@5 : i32, proj_loans (s@5 : i32))
+  }
+  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+}
 
-**Context**:
-# Ended regions: {}
+[Debug] end_abstraction: 1
+- original context:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> s@1 : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⌊shared@3⌋ ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  abs@1{parents={}}{regions={1}} {
+    ⌊shared@2⌋,
+    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  }
+  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
 }
 
 
+- new context:
+# Ended regions: {0, 1}
+# 1 frame(s)
 
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  None -> s@3 : std::boxed::Box<i32> ;
+}
+
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> true ;
+  Some (var@0) -> ⊥ : () ;
+  Some (b) -> ⊥ : std::boxed::Box<i32> ;
+  Some (x) -> ⊥ : &'_ mut (i32) ;
+  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
+  Some (x) -> ⊥ : &'_ (i32) ;
+  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
-- op:
-move var@3
 
+[Debug] test_function_symbolic: copy_int
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := - move var@2;
+  var@0 := copy x;
   return
 ]
 
@@ -119856,15 +118557,13 @@ move var@3
 {
   Some (var@0) -> ⊥ : i32 ;
   Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := - move var@2
+  var@0 := copy x
 ]
 
 **Context**:
@@ -119875,8 +118574,6 @@ move var@3
 {
   Some (var@0) -> ⊥ : i32 ;
   Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> ⊥ : bool ;
 }
 
 
@@ -119890,13 +118587,11 @@ move var@3
 {
   Some (var@0) -> ⊥ : i32 ;
   Some (x) -> s@0 : i32 ;
-  Some (var@2) -> s@0 : i32 ;
-  Some (var@3) -> ⊥ : bool ;
 }
 
 
 - op:
-move var@2
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
@@ -119909,19 +118604,24 @@ move var@2
 
 # Frame 0:
 {
-  Some (var@0) -> s@2 : i32 ;
+  Some (var@0) -> s@0 : i32 ;
   Some (x) -> s@0 : i32 ;
-  Some (var@2) -> ⊥ : i32 ;
-  Some (var@3) -> ⊥ : bool ;
 }
 
 
 
-[Debug] test_function_symbolic: test_neg1
+[Debug] test_function_symbolic: test_copy_int
 [Debug] 
 **About to evaluate statement**: [
-  x := 3: i32;
-  y := -3: i32;
+  x := 0: i32;
+  px := &x;
+  var@4 := copy x;
+  y := move copy_int(move var@4);
+  var@7 := copy *(px);
+  var@8 := copy y;
+  var@6 := move var@7 == move var@8;
+  var@5 := ¬ move var@6;
+  assert(¬move var@5);
   return
 ]
 
@@ -119933,14 +118633,20 @@ move var@2
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ (i32) ;
   Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 3: i32
+  x := 0: i32
 ]
 
 **Context**:
@@ -119951,7 +118657,13 @@ move var@2
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ (i32) ;
   Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
@@ -119965,16 +118677,29 @@ move var@2
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ (i32) ;
   Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 - op:
-3: i32
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  y := -3: i32;
+  px := &x;
+  var@4 := copy x;
+  y := move copy_int(move var@4);
+  var@7 := copy *(px);
+  var@8 := copy y;
+  var@6 := move var@7 == move var@8;
+  var@5 := ¬ move var@6;
+  assert(¬move var@5);
   return
 ]
 
@@ -119985,15 +118710,21 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 3: i32 ;
+  Some (x) -> 0: i32 ;
+  Some (px) -> ⊥ : &'_ (i32) ;
   Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  y := -3: i32
+  px := &x
 ]
 
 **Context**:
@@ -120003,31 +118734,52 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 3: i32 ;
+  Some (x) -> 0: i32 ;
+  Some (px) -> ⊥ : &'_ (i32) ;
   Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@4 := copy x;
+  y := move copy_int(move var@4);
+  var@7 := copy *(px);
+  var@8 := copy y;
+  var@6 := move var@7 == move var@8;
+  var@5 := ¬ move var@6;
+  assert(¬move var@5);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 3: i32 ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
   Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
-- op:
--3: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  return
+  var@4 := copy x
 ]
 
 **Context**:
@@ -120037,46 +118789,49 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 3: i32 ;
-  Some (y) -> -3: i32 ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] test_function_symbolic: refs_test1
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: i32;
-  px := &mut x;
-  ppx := &mut px;
-  *(*(ppx)) := 1: i32;
-  var@6 := copy x;
-  var@5 := move var@6 == 1: i32;
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
+- op:
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32
+  y := move copy_int(move var@4);
+  var@7 := copy *(px);
+  var@8 := copy y;
+  var@6 := move var@7 == move var@8;
+  var@5 := ¬ move var@6;
+  assert(¬move var@5);
+  return
 ]
 
 **Context**:
@@ -120086,68 +118841,72 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> 0: i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  y := move copy_int(move var@4)
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> 0: i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
-- op:
-0: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x;
-  ppx := &mut px;
-  *(*(ppx)) := 1: i32;
-  var@6 := copy x;
-  var@5 := move var@6 == 1: i32;
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  return
-]
 
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> ⊥ : i32 ;
+  Some (var@4) -> 0: i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
+- op:
+move var@4
 
 [Debug] 
 **About to evaluate statement**: [
-  px := &mut x
+  var@7 := copy *(px);
+  var@8 := copy y;
+  var@6 := move var@7 == move var@8;
+  var@5 := ¬ move var@6;
+  assert(¬move var@5);
+  return
 ]
 
 **Context**:
@@ -120157,25 +118916,21 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppx := &mut px;
-  *(*(ppx)) := 1: i32;
-  var@6 := copy x;
-  var@5 := move var@6 == 1: i32;
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  return
+  var@7 := copy *(px)
 ]
 
 **Context**:
@@ -120185,45 +118940,46 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  ppx := &mut px
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
+- op:
+copy *(px)
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppx)) := 1: i32;
-  var@6 := copy x;
-  var@5 := move var@6 == 1: i32;
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
+  var@8 := copy y;
+  var@6 := move var@7 == move var@8;
+  var@5 := ¬ move var@6;
+  assert(¬move var@5);
   return
 ]
 
@@ -120234,19 +118990,21 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> 0: i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppx)) := 1: i32
+  var@8 := copy y
 ]
 
 **Context**:
@@ -120256,12 +119014,14 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> 0: i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
@@ -120274,24 +119034,25 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> 0: i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 - op:
-1: i32
+copy y
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := copy x;
-  var@5 := move var@6 == 1: i32;
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
+  var@6 := move var@7 == move var@8;
+  var@5 := ¬ move var@6;
+  assert(¬move var@5);
   return
 ]
 
@@ -120302,19 +119063,21 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> 0: i32 ;
+  Some (var@8) -> s@0 : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := copy x
+  var@6 := move var@7 == move var@8
 ]
 
 **Context**:
@@ -120324,14 +119087,16 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
-}
-
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> 0: i32 ;
+  Some (var@8) -> s@0 : i32 ;
+}
+
 
 
 [Debug] eval_operand:
@@ -120342,148 +119107,117 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> 0: i32 ;
+  Some (var@8) -> s@0 : i32 ;
 }
 
 
 - op:
-copy x
-
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
-}
+move var@7
 
-[Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.OuterBorrows (InterpreterBorrowsCore.Borrow 1))
-[Debug] end borrow: 1:
-- original context:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (1: i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> s@0 : i32 ;
 }
 
-[Debug] give_back:
-- bid: 1
-- content: &mut@1 (&mut@0 (1: i32))
-- context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
-}
+- op:
+move var@8
 
+[Debug] 
+**About to evaluate statement**: [
+  var@5 := ¬ move var@6;
+  assert(¬move var@5);
+  return
+]
 
-[Debug] give_back_value:
-- bid: 1
-- value: &mut@0 (1: i32)
-- context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> s@1 : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (1: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
-}
+[Debug] 
+**About to evaluate statement**: [
+  var@5 := ¬ move var@6
+]
 
-[Debug] give_back:
-- bid: 0
-- content: &mut@0 (1: i32)
-- context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> s@1 : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 0
-- value: 1: i32
-- context:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> s@1 : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
+- op:
+move var@6
+
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := move var@6 == 1: i32;
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
+  assert(¬move var@5);
   return
 ]
 
@@ -120494,19 +119228,21 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> 1: i32 ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> s@2 : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := move var@6 == 1: i32
+  assert(¬move var@5)
 ]
 
 **Context**:
@@ -120516,12 +119252,14 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> 1: i32 ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> s@2 : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
@@ -120534,42 +119272,59 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> 1: i32 ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
+  Some (var@5) -> true ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@6
+move var@5
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (x) -> @shared_loan({0}, 0: i32) ;
+  Some (px) -> ⌊shared@0⌋ ;
+  Some (y) -> s@0 : i32 ;
+  Some (var@4) -> ⊥ : i32 ;
   Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : i32 ;
+  Some (var@8) -> ⊥ : i32 ;
 }
 
 
-- op:
-1: i32
 
+[Debug] test_function_symbolic: is_cons
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
+  var@2 := discriminant(*(l));
+  switch (move var@2) {
+    0: isize => {
+      var@0 := true
+    }
+    1: isize => {
+      var@0 := false
+    }
+    _ => {
+      panic
+    }
+  };
   return
 ]
 
@@ -120579,20 +119334,19 @@ move var@6
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> s@0 : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 (test1::List<T>))
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> s@0 : &r@0 (test1::List<T>) ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := ¬ move var@5
+  var@2 := discriminant(*(l))
 ]
 
 **Context**:
@@ -120601,40 +119355,61 @@ move var@6
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> s@0 : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 (test1::List<T>))
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> s@0 : &r@0 (test1::List<T>) ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] expand_symbolic_value: s@0 : &r@0 (test1::List<T>)
+
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> s@0 : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 (test1::List<T>))
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> s@0 : &r@0 (test1::List<T>) ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
-- op:
-move var@5
+- new context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, s@1 : test1::List<T>, proj_loans (s@1 : test1::List<T>))
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> ⊥ : isize ;
+}
+
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@4);
+  switch (move var@2) {
+    0: isize => {
+      var@0 := true
+    }
+    1: isize => {
+      var@0 := false
+    }
+    _ => {
+      panic
+    }
+  };
   return
 ]
 
@@ -120644,20 +119419,29 @@ move var@5
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> s@1 : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> 0: isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@4)
+  switch (move var@2) {
+    0: isize => {
+      var@0 := true
+    }
+    1: isize => {
+      var@0 := false
+    }
+    _ => {
+      panic
+    }
+  }
 ]
 
 **Context**:
@@ -120666,13 +119450,12 @@ move var@5
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> s@1 : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> 0: isize ;
 }
 
 
@@ -120684,22 +119467,21 @@ move var@5
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> true ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> 0: isize ;
 }
 
 
 - op:
-move var@4
+move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  return
+  var@0 := true
 ]
 
 **Context**:
@@ -120708,79 +119490,38 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
 
-[Debug] test_function_symbolic: refs_test2
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: i32;
-  y := 1: i32;
-  px := &mut x;
-  py := &mut y;
-  ppx := &mut px;
-  var@6 := &mut *(py);
-  *(ppx) := move var@6;
-  *(*(ppx)) := 2: i32;
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
+- op:
+true
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32
+  return
 ]
 
 **Context**:
@@ -120789,86 +119530,29 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+  }
+  Some (var@0) -> true ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
-- op:
-0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  y := 1: i32;
-  px := &mut x;
-  py := &mut y;
-  ppx := &mut px;
-  var@6 := &mut *(py);
-  *(ppx) := move var@6;
-  *(*(ppx)) := 2: i32;
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  switch (move var@2) {
+    0: isize => {
+      var@0 := true
+    }
+    1: isize => {
+      var@0 := false
+    }
+    _ => {
+      panic
+    }
+  };
   return
 ]
 
@@ -120878,32 +119562,29 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> 1: isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  y := 1: i32
+  switch (move var@2) {
+    0: isize => {
+      var@0 := true
+    }
+    1: isize => {
+      var@0 := false
+    }
+    _ => {
+      panic
+    }
+  }
 ]
 
 **Context**:
@@ -120912,25 +119593,12 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> 1: isize ;
 }
 
 
@@ -120942,56 +119610,21 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> 1: isize ;
 }
 
 
 - op:
-1: i32
+move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  px := &mut x;
-  py := &mut y;
-  ppx := &mut px;
-  var@6 := &mut *(py);
-  *(ppx) := move var@6;
-  *(*(ppx)) := 2: i32;
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
+  var@0 := false
 ]
 
 **Context**:
@@ -121000,86 +119633,37 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 1: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+  }
+  Some (var@0) -> ⊥ : bool ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
+- op:
+false
 
 [Debug] 
 **About to evaluate statement**: [
-  py := &mut y;
-  ppx := &mut px;
-  var@6 := &mut *(py);
-  *(ppx) := move var@6;
-  *(*(ppx)) := 2: i32;
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
   return
 ]
 
@@ -121089,32 +119673,31 @@ move var@4
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> 1: i32 ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+  }
+  Some (var@0) -> false ;
+  Some (l) -> ⌊shared@0⌋ ;
+  Some (var@2) -> ⊥ : isize ;
 }
 
 
 
+[Debug] test_function_symbolic: test_is_cons
 [Debug] 
 **About to evaluate statement**: [
-  py := &mut y
+  set_discriminant(var@3, 1);
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  var@7 := &l;
+  var@6 := copy var@7;
+  var@5 := move is_cons<i32>(move var@6);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
+  return
 ]
 
 **Context**:
@@ -121124,51 +119707,20 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> 1: i32 ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppx := &mut px;
-  var@6 := &mut *(py);
-  *(ppx) := move var@6;
-  *(*(ppx)) := 2: i32;
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
+  set_discriminant(var@3, 1)
 ]
 
 **Context**:
@@ -121178,31 +119730,30 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (py) -> &mut@1 (1: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppx := &mut px
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  var@7 := &l;
+  var@6 := copy var@7;
+  var@5 := move is_cons<i32>(move var@6);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
+  return
 ]
 
 **Context**:
@@ -121212,50 +119763,20 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (py) -> &mut@1 (1: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> test1::List::Nil ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := &mut *(py);
-  *(ppx) := move var@6;
-  *(*(ppx)) := 2: i32;
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3)
 ]
 
 **Context**:
@@ -121265,82 +119786,54 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (1: i32) ;
-  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> test1::List::Nil ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@6 := &mut *(py)
-]
-
-**Context**:
+[Debug] eval_non_local_function_call:
+- fid:CfimAst.BoxNew
+- type_params: [test1::List<i32>]
+- args: [move var@3]
+- dest: var@2
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (1: i32) ;
-  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> test1::List::Nil ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
+- op:
+move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  *(ppx) := move var@6;
-  *(*(ppx)) := 2: i32;
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  var@7 := &l;
+  var@6 := copy var@7;
+  var@5 := move is_cons<i32>(move var@6);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
   return
 ]
 
@@ -121351,31 +119844,20 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@6) -> &mut@3 (1: i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(ppx) := move var@6
+  (l as test1::List::Cons).0 := 0: i32
 ]
 
 **Context**:
@@ -121385,24 +119867,13 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@6) -> &mut@3 (1: i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
@@ -121415,145 +119886,32 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@6) -> &mut@3 (1: i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 - op:
-move var@6
-
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (⊥ : &'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  None -> &mut@3 (1: i32) ;
-  None -> &mut@0 (0: i32) ;
-}
-
-[Debug] give_back:
-- bid: 0
-- content: &mut@0 (0: i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (⊥ : &'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  None -> &mut@3 (1: i32) ;
-  None -> ⊥ : &'_ mut (i32) ;
-}
-
-
-[Debug] give_back_value:
-- bid: 0
-- value: 0: i32
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (⊥ : &'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  None -> &mut@3 (1: i32) ;
-  None -> ⊥ : &'_ mut (i32) ;
-}
-
+0: i32
 
+[Debug] expand_bottom_value_from_projection:
+pe: (Expressions.Field ((Expressions.ProjAdt (1, (Some 0))), 0))
+ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppx)) := 2: i32;
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  var@7 := &l;
+  var@6 := copy var@7;
+  var@5 := move is_cons<i32>(move var@6);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
   return
 ]
 
@@ -121564,31 +119922,20 @@ move var@6
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@3 (1: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppx)) := 2: i32
+  (l as test1::List::Cons).1 := move var@2
 ]
 
 **Context**:
@@ -121598,24 +119945,13 @@ move var@6
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@3 (1: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
@@ -121628,48 +119964,28 @@ move var@6
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@3 (1: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 - op:
-2: i32
+move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := copy *(px);
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  set_discriminant(l, 0);
+  var@7 := &l;
+  var@6 := copy var@7;
+  var@5 := move is_cons<i32>(move var@6);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
   return
 ]
 
@@ -121680,31 +119996,20 @@ move var@6
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@3 (2: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := copy *(px)
+  set_discriminant(l, 0)
 ]
 
 **Context**:
@@ -121714,167 +120019,76 @@ move var@6
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@3 (2: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@3 (2: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-copy *(px)
+[Debug] 
+**About to evaluate statement**: [
+  var@7 := &l;
+  var@6 := copy var@7;
+  var@5 := move is_cons<i32>(move var@6);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
+  return
+]
 
-[Debug] end borrow: 2:
-- original context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> &mut@2 (&mut@3 (2: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
-[Debug] give_back:
-- bid: 2
-- content: &mut@2 (&mut@3 (2: i32))
-- context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
 
+[Debug] 
+**About to evaluate statement**: [
+  var@7 := &l
+]
 
-[Debug] give_back_value:
-- bid: 2
-- value: &mut@3 (2: i32)
-- context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⌊mut@2⌋ ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
+
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := move var@9 == 2: i32;
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  var@6 := copy var@7;
+  var@5 := move is_cons<i32>(move var@6);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
   return
 ]
 
@@ -121885,31 +120099,20 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> 2: i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := move var@9 == 2: i32
+  var@6 := copy var@7
 ]
 
 **Context**:
@@ -121919,59 +120122,16 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> 2: i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> 2: i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
 }
 
 
-- op:
-move var@9
 
 [Debug] eval_operand:
 - ctx:
@@ -121981,46 +120141,25 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
 }
 
 
 - op:
-2: i32
+copy var@7
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := ¬ move var@8;
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  var@5 := move is_cons<i32>(move var@6);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
   return
 ]
 
@@ -122031,31 +120170,20 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@0 : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⌊shared@1⌋ ;
+  Some (var@7) -> ⌊shared@0⌋ ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := ¬ move var@8
+  var@5 := move is_cons<i32>(move var@6)
 ]
 
 **Context**:
@@ -122065,24 +120193,13 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@0 : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⌊shared@1⌋ ;
+  Some (var@7) -> ⌊shared@0⌋ ;
 }
 
 
@@ -122095,45 +120212,24 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@0 : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⌊shared@1⌋ ;
+  Some (var@7) -> ⌊shared@0⌋ ;
 }
 
 
 - op:
-move var@8
+move var@6
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@7);
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  var@4 := ¬ move var@5;
+  assert(¬move var@4);
+  drop(l);
   return
 ]
 
@@ -122144,31 +120240,24 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> s@1 : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> s@1 : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@7)
+  var@4 := ¬ move var@5
 ]
 
 **Context**:
@@ -122178,24 +120267,17 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> s@1 : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> s@1 : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
 }
 
 
@@ -122208,44 +120290,27 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> true ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> s@1 : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
 }
 
 
 - op:
-move var@7
+move var@5
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := copy x;
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  assert(¬move var@4);
+  drop(l);
   return
 ]
 
@@ -122256,31 +120321,24 @@ move var@7
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> s@2 : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := copy x
+  assert(¬move var@4)
 ]
 
 **Context**:
@@ -122290,24 +120348,17 @@ move var@7
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> s@2 : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
 }
 
 
@@ -122320,43 +120371,26 @@ move var@7
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> true ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
 }
 
 
 - op:
-copy x
+move var@4
 
 [Debug] 
 **About to evaluate statement**: [
-  var@11 := move var@12 == 0: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  drop(l);
   return
 ]
 
@@ -122367,31 +120401,24 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> 0: i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@11 := move var@12 == 0: i32
+  drop(l)
 ]
 
 **Context**:
@@ -122401,214 +120428,246 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> 0: i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] drop_value: place: l
+[Debug] end borrow: 0:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> 0: i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⌊shared@0⌋ ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
+  None -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
 }
 
-
-- op:
-move var@12
-
-[Debug] eval_operand:
-- ctx:
+[Debug] give_back:
+- bid: 0
+- content: ⌊shared@0⌋
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
+  None -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
 }
 
 
-- op:
-0: i32
+[Debug] end borrow: 1:
+- original context:
+# Ended regions: {}
+# 1 frame(s)
 
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
+  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+}
 
-**Context**:
+[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
+[Debug] end_abstraction: 0
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@2 : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
+  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
 }
 
+[Debug] end_abstraction: 0
+- context after parent abstractions ended:
+# Ended regions: {}
+# 1 frame(s)
 
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
+  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+}
 
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := ¬ move var@11
-]
+[Debug] end_abstraction: 0
+- context after loans ended:
+# Ended regions: {}
+# 1 frame(s)
 
-**Context**:
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
+  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+}
+
+[Debug] end_abstraction: 0
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@2 : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊shared@1⌋,
+    proj_loans (s@1 : bool)
+  }
+  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
 }
 
 
+- new context:
+# Ended regions: {0}
+# 1 frame(s)
 
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  None -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+}
+
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@2 : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@4) -> ⊥ : bool ;
+  Some (var@5) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
 }
 
 
-- op:
-move var@11
 
+[Debug] test_function_symbolic: split_list
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@10);
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
+  var@8 := false;
+  var@7 := false;
+  var@7 := true;
+  var@8 := true;
+  var@2 := discriminant(l);
+  switch (move var@2) {
+    0: isize => {
+      var@8 := false;
+      hd := move (l as test1::List::Cons).0;
+      var@7 := false;
+      tl := move (l as test1::List::Cons).1;
+      var@5 := move hd;
+      var@6 := move deref_box(tl);
+      (var@0).0 := move var@5;
+      (var@0).1 := move var@6;
+      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+      return
+    }
+    _ => {
+      panic
+    }
+  }
 ]
 
 **Context**:
@@ -122617,32 +120676,24 @@ move var@11
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
   Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> s@3 : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@10)
+  var@8 := false
 ]
 
 **Context**:
@@ -122651,25 +120702,17 @@ move var@11
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
   Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> s@3 : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -122681,42 +120724,46 @@ move var@11
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
   Some (var@7) -> ⊥ : bool ;
   Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> true ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-move var@10
+false
 
 [Debug] 
 **About to evaluate statement**: [
-  var@15 := copy *(py);
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
+  var@7 := false;
+  var@7 := true;
+  var@8 := true;
+  var@2 := discriminant(l);
+  switch (move var@2) {
+    0: isize => {
+      var@8 := false;
+      hd := move (l as test1::List::Cons).0;
+      var@7 := false;
+      tl := move (l as test1::List::Cons).1;
+      var@5 := move hd;
+      var@6 := move deref_box(tl);
+      (var@0).0 := move var@5;
+      (var@0).1 := move var@6;
+      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+      return
+    }
+    _ => {
+      panic
+    }
+  }
 ]
 
 **Context**:
@@ -122725,32 +120772,24 @@ move var@10
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@15 := copy *(py)
+  var@7 := false
 ]
 
 **Context**:
@@ -122759,25 +120798,17 @@ move var@10
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -122789,131 +120820,139 @@ move var@10
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
   Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-copy *(py)
+false
 
-[Debug] end borrow: 3:
-- original context:
+[Debug] 
+**About to evaluate statement**: [
+  var@7 := true;
+  var@8 := true;
+  var@2 := discriminant(l);
+  switch (move var@2) {
+    0: isize => {
+      var@8 := false;
+      hd := move (l as test1::List::Cons).0;
+      var@7 := false;
+      tl := move (l as test1::List::Cons).1;
+      var@5 := move hd;
+      var@6 := move deref_box(tl);
+      (var@0).0 := move var@5;
+      (var@0).1 := move var@6;
+      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+      return
+    }
+    _ => {
+      panic
+    }
+  }
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> &mut@3 (2: i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
-[Debug] give_back:
-- bid: 3
-- content: &mut@3 (2: i32)
-- context:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  var@7 := true
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
-[Debug] give_back_value:
-- bid: 3
-- value: 2: i32
-- context:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (⌊mut@3⌋) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
+- op:
+true
+
 [Debug] 
 **About to evaluate statement**: [
-  var@14 := move var@15 == 2: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
+  var@8 := true;
+  var@2 := discriminant(l);
+  switch (move var@2) {
+    0: isize => {
+      var@8 := false;
+      hd := move (l as test1::List::Cons).0;
+      var@7 := false;
+      tl := move (l as test1::List::Cons).1;
+      var@5 := move hd;
+      var@6 := move deref_box(tl);
+      (var@0).0 := move var@5;
+      (var@0).1 := move var@6;
+      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+      return
+    }
+    _ => {
+      panic
+    }
+  }
 ]
 
 **Context**:
@@ -122922,32 +120961,24 @@ copy *(py)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> 2: i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@14 := move var@15 == 2: i32
+  var@8 := true
 ]
 
 **Context**:
@@ -122956,25 +120987,17 @@ copy *(py)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> 2: i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -122986,72 +121009,69 @@ copy *(py)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> 2: i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-move var@15
+true
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@2 := discriminant(l);
+  switch (move var@2) {
+    0: isize => {
+      var@8 := false;
+      hd := move (l as test1::List::Cons).0;
+      var@7 := false;
+      tl := move (l as test1::List::Cons).1;
+      var@5 := move hd;
+      var@6 := move deref_box(tl);
+      (var@0).0 := move var@5;
+      (var@0).1 := move var@6;
+      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+      return
+    }
+    _ => {
+      panic
+    }
+  }
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
-- op:
-2: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
+  var@2 := discriminant(l)
 ]
 
 **Context**:
@@ -123060,32 +121080,40 @@ move var@15
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@4 : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> s@0 : test1::List<T> ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := ¬ move var@14
+  switch (move var@2) {
+    0: isize => {
+      var@8 := false;
+      hd := move (l as test1::List::Cons).0;
+      var@7 := false;
+      tl := move (l as test1::List::Cons).1;
+      var@5 := move hd;
+      var@6 := move deref_box(tl);
+      (var@0).0 := move var@5;
+      (var@0).1 := move var@6;
+      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+      return
+    }
+    _ => {
+      panic
+    }
+  }
 ]
 
 **Context**:
@@ -123094,25 +121122,17 @@ move var@15
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@4 : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> 0: isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -123124,38 +121144,34 @@ move var@15
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@4 : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> 0: isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-move var@14
+move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  var@8 := false;
+  hd := move (l as test1::List::Cons).0;
+  var@7 := false;
+  tl := move (l as test1::List::Cons).1;
+  var@5 := move hd;
+  var@6 := move deref_box(tl);
+  (var@0).0 := move var@5;
+  (var@0).1 := move var@6;
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
   return
 ]
 
@@ -123165,32 +121181,24 @@ move var@14
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> s@5 : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@13)
+  var@8 := false
 ]
 
 **Context**:
@@ -123199,25 +121207,17 @@ move var@14
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> s@5 : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -123229,37 +121229,33 @@ move var@14
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> true ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-move var@13
+false
 
 [Debug] 
 **About to evaluate statement**: [
-  var@18 := copy y;
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  hd := move (l as test1::List::Cons).0;
+  var@7 := false;
+  tl := move (l as test1::List::Cons).1;
+  var@5 := move hd;
+  var@6 := move deref_box(tl);
+  (var@0).0 := move var@5;
+  (var@0).1 := move var@6;
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
   return
 ]
 
@@ -123269,32 +121265,24 @@ move var@13
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
+}
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@18 := copy y
+  hd := move (l as test1::List::Cons).0
 ]
 
 **Context**:
@@ -123303,25 +121291,17 @@ move var@13
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -123333,126 +121313,114 @@ move var@13
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-copy y
+move (l as test1::List::Cons).0
 
-[Debug] end borrow: 1:
-- original context:
+[Debug] 
+**About to evaluate statement**: [
+  var@7 := false;
+  tl := move (l as test1::List::Cons).1;
+  var@5 := move hd;
+  var@6 := move deref_box(tl);
+  (var@0).0 := move var@5;
+  (var@0).1 := move var@6;
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> &mut@1 (2: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
-[Debug] give_back:
-- bid: 1
-- content: &mut@1 (2: i32)
-- context:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  var@7 := false
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
-[Debug] give_back_value:
-- bid: 1
-- value: 2: i32
-- context:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⌊mut@1⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
+- op:
+false
+
 [Debug] 
 **About to evaluate statement**: [
-  var@17 := move var@18 == 2: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  tl := move (l as test1::List::Cons).1;
+  var@5 := move hd;
+  var@6 := move deref_box(tl);
+  (var@0).0 := move var@5;
+  (var@0).1 := move var@6;
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
   return
 ]
 
@@ -123462,32 +121430,24 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> 2: i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@17 := move var@18 == 2: i32
+  tl := move (l as test1::List::Cons).1
 ]
 
 **Context**:
@@ -123496,60 +121456,20 @@ copy y
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> 2: i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> 2: i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
-- op:
-move var@18
 
 [Debug] eval_operand:
 - ctx:
@@ -123558,35 +121478,30 @@ move var@18
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-2: i32
+move (l as test1::List::Cons).1
 
 [Debug] 
 **About to evaluate statement**: [
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  var@5 := move hd;
+  var@6 := move deref_box(tl);
+  (var@0).0 := move var@5;
+  (var@0).1 := move var@6;
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
   return
 ]
 
@@ -123596,32 +121511,24 @@ move var@18
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@6 : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@16 := ¬ move var@17
+  var@5 := move hd
 ]
 
 **Context**:
@@ -123630,25 +121537,17 @@ move var@18
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@6 : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -123660,34 +121559,29 @@ move var@18
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@6 : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> s@1 : T ;
+  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-move var@17
+move hd
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@16);
+  var@6 := move deref_box(tl);
+  (var@0).0 := move var@5;
+  (var@0).1 := move var@6;
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
   return
 ]
 
@@ -123697,32 +121591,24 @@ move var@17
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> s@7 : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> s@1 : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@16)
+  var@6 := move deref_box(tl)
 ]
 
 **Context**:
@@ -123731,25 +121617,17 @@ move var@17
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> s@7 : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> s@1 : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -123761,74 +121639,70 @@ move var@17
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> true ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> s@1 : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-move var@16
+move deref_box(tl)
 
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
+[Debug] expand_symbolic_value: s@2 : std::boxed::Box<test1::List<T>>
 
-**Context**:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 2: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : i32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> s@1 : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
+- new context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(s@3 : test1::List<T>) ;
+  Some (var@5) -> s@1 : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
+}
+
 
-[Debug] test_function_symbolic: test_list1
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(var@3, 1);
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  drop(l);
+  (var@0).0 := move var@5;
+  (var@0).1 := move var@6;
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
   return
 ]
 
@@ -123838,17 +121712,24 @@ move var@16
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(⊥ : test1::List<T>) ;
+  Some (var@5) -> s@1 : T ;
+  Some (var@6) -> s@3 : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(var@3, 1)
+  (var@0).0 := move var@5
 ]
 
 **Context**:
@@ -123857,21 +121738,55 @@ move var@16
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(⊥ : test1::List<T>) ;
+  Some (var@5) -> s@1 : T ;
+  Some (var@6) -> s@3 : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
+}
+
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(⊥ : test1::List<T>) ;
+  Some (var@5) -> s@1 : T ;
+  Some (var@6) -> s@3 : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
+- op:
+move var@5
 
+[Debug] expand_bottom_value_from_projection:
+pe: (Expressions.Field ((Expressions.ProjTuple 2), 0))
+ty: (Types.Adt (Types.Tuple, [],
+   [(Types.TypeVar 0); (Types.Adt ((Types.AdtId 1), [], [(Types.TypeVar 0)]))
+     ]
+   ))
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  drop(l);
+  (var@0).1 := move var@6;
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
   return
 ]
 
@@ -123881,17 +121796,24 @@ move var@16
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
+  Some (var@0) -> (s@1 : T, ⊥ : test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(⊥ : test1::List<T>) ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> s@3 : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3)
+  (var@0).1 := move var@6
 ]
 
 **Context**:
@@ -123900,19 +121822,21 @@ move var@16
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
+  Some (var@0) -> (s@1 : T, ⊥ : test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(⊥ : test1::List<T>) ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> s@3 : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
-[Debug] eval_non_local_function_call:
-- fid:CfimAst.BoxNew
-- type_params: [test1::List<i32>]
-- args: [move var@3]
-- dest: var@2
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -123920,22 +121844,26 @@ move var@16
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
+  Some (var@0) -> (s@1 : T, ⊥ : test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(⊥ : test1::List<T>) ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> s@3 : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 - op:
-move var@3
+move var@6
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  drop(l);
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
   return
 ]
 
@@ -123945,17 +121873,24 @@ move var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@0) -> (s@1 : T, s@3 : test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(⊥ : test1::List<T>) ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).0 := 0: i32
+  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl)
 ]
 
 **Context**:
@@ -123964,39 +121899,29 @@ move var@3
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@0) -> (s@1 : T, s@3 : test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> @Box(⊥ : test1::List<T>) ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
-- op:
-0: i32
 
-[Debug] expand_bottom_value_from_projection:
-pe: (Expressions.Field ((Expressions.ProjAdt (1, (Some 0))), 0))
-ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
+[Debug] eval_non_local_function_call:
+- fid:CfimAst.BoxFree
+- type_params: [test1::List<T>]
+- args: [move tl]
+- dest: var@9
+[Debug] drop_value: place: tl
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  drop(l);
   return
 ]
 
@@ -124006,17 +121931,40 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@0) -> (s@1 : T, s@3 : test1::List<T>) ;
+  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> false ;
+  Some (var@8) -> false ;
+  Some (var@9) -> () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).1 := move var@2
+  switch (move var@2) {
+    0: isize => {
+      var@8 := false;
+      hd := move (l as test1::List::Cons).0;
+      var@7 := false;
+      tl := move (l as test1::List::Cons).1;
+      var@5 := move hd;
+      var@6 := move deref_box(tl);
+      (var@0).0 := move var@5;
+      (var@0).1 := move var@6;
+      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+      return
+    }
+    _ => {
+      panic
+    }
+  }
 ]
 
 **Context**:
@@ -124025,10 +121973,17 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Nil ;
+  Some (var@2) -> 1: isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -124040,10 +121995,17 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Nil ;
+  Some (var@2) -> 1: isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
@@ -124052,9 +122014,7 @@ move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(l, 0);
-  drop(l);
-  return
+  panic
 ]
 
 **Context**:
@@ -124063,17 +122023,39 @@ move var@2
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
+  Some (l) -> test1::List::Nil ;
+  Some (var@2) -> ⊥ : isize ;
+  Some (hd) -> ⊥ : T ;
+  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
+  Some (var@5) -> ⊥ : T ;
+  Some (var@6) -> ⊥ : test1::List<T> ;
+  Some (var@7) -> true ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : () ;
+  Some (var@10) -> ⊥ : isize ;
 }
 
 
 
+[Debug] test_function_symbolic: test_split_list
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(l, 0)
+  set_discriminant(var@3, 1);
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  var@7 := move l;
+  var@6 := move split_list<i32>(move var@7);
+  hd := copy (var@6).0;
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
+  return
 ]
 
 **Context**:
@@ -124083,17 +122065,23 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (l) -> ⊥ : test1::List<i32> ;
   Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
   Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  drop(l);
-  return
+  set_discriminant(var@3, 1)
 ]
 
 **Context**:
@@ -124103,16 +122091,36 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (l) -> ⊥ : test1::List<i32> ;
   Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
   Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  drop(l)
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  var@7 := move l;
+  var@6 := move split_list<i32>(move var@7);
+  hd := copy (var@6).0;
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
+  return
 ]
 
 **Context**:
@@ -124122,17 +122130,23 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (l) -> ⊥ : test1::List<i32> ;
   Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@3) -> test1::List::Nil ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] drop_value: place: l
 [Debug] 
 **About to evaluate statement**: [
-  return
+  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3)
 ]
 
 **Context**:
@@ -124144,25 +122158,61 @@ move var@2
   Some (var@0) -> ⊥ : () ;
   Some (l) -> ⊥ : test1::List<i32> ;
   Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (var@3) -> test1::List::Nil ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] test_function_symbolic: test_box1
+[Debug] eval_non_local_function_call:
+- fid:CfimAst.BoxNew
+- type_params: [test1::List<i32>]
+- args: [move var@3]
+- dest: var@2
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> test1::List::Nil ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
+}
+
+
+- op:
+move var@3
+
 [Debug] 
 **About to evaluate statement**: [
-  b := move alloc::boxed::Box<i32>::new(0: i32);
-  var@3 := &two-phase b;
-  x := move core::ops::deref::DerefMut<i32>::deref_mut(move var@3);
-  *(x) := 1: i32;
-  var@5 := &b;
-  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
-  var@8 := copy *(x);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
+  (l as test1::List::Cons).0 := 0: i32;
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  var@7 := move l;
+  var@6 := move split_list<i32>(move var@7);
+  hd := copy (var@6).0;
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
@@ -124173,21 +122223,23 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  b := move alloc::boxed::Box<i32>::new(0: i32)
+  (l as test1::List::Cons).0 := 0: i32
 ]
 
 **Context**:
@@ -124197,23 +122249,20 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_non_local_function_call:
-- fid:CfimAst.BoxNew
-- type_params: [i32]
-- args: [0: i32]
-- dest: b
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -124222,32 +122271,38 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 - op:
 0: i32
 
+[Debug] expand_bottom_value_from_projection:
+pe: (Expressions.Field ((Expressions.ProjAdt (1, (Some 0))), 0))
+ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := &two-phase b;
-  x := move core::ops::deref::DerefMut<i32>::deref_mut(move var@3);
-  *(x) := 1: i32;
-  var@5 := &b;
-  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
-  var@8 := copy *(x);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
+  (l as test1::List::Cons).1 := move var@2;
+  set_discriminant(l, 0);
+  var@7 := move l;
+  var@6 := move split_list<i32>(move var@7);
+  hd := copy (var@6).0;
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
@@ -124258,21 +122313,23 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> s@0 : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@3 := &two-phase b
+  (l as test1::List::Cons).1 := move var@2
 ]
 
 **Context**:
@@ -124282,54 +122339,57 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> s@0 : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  x := move core::ops::deref::DerefMut<i32>::deref_mut(move var@3);
-  *(x) := 1: i32;
-  var@5 := &b;
-  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
-  var@8 := copy *(x);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({0}, s@0 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⌊inactivated_mut@0⌋ ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
+- op:
+move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  x := move core::ops::deref::DerefMut<i32>::deref_mut(move var@3)
+  set_discriminant(l, 0);
+  var@7 := move l;
+  var@6 := move split_list<i32>(move var@7);
+  hd := copy (var@6).0;
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
+  return
 ]
 
 **Context**:
@@ -124339,57 +122399,57 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({0}, s@0 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⌊inactivated_mut@0⌋ ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_non_local_function_call:
-- fid:CfimAst.BoxDerefMut
-- type_params: [i32]
-- args: [move var@3]
-- dest: x
-[Debug] activate_inactivated_mut_borrow: resulting value:
-s@0 : std::boxed::Box<i32>
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  set_discriminant(l, 0)
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> &mut@0 (s@0 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
-- op:
-move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  *(x) := 1: i32;
-  var@5 := &b;
-  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
-  var@8 := copy *(x);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
+  var@7 := move l;
+  var@6 := move split_list<i32>(move var@7);
+  hd := copy (var@6).0;
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
@@ -124400,25 +122460,23 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> s@1 : &r@0 mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    proj_loans (s@1 : &r@0 mut (i32))
-  }
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(x) := 1: i32
+  var@7 := move l
 ]
 
 **Context**:
@@ -124428,18 +122486,16 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> s@1 : &r@0 mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    proj_loans (s@1 : &r@0 mut (i32))
-  }
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
@@ -124452,81 +122508,32 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> s@1 : &r@0 mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    proj_loans (s@1 : &r@0 mut (i32))
-  }
+  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 - op:
-1: i32
-
-[Debug] expand_symbolic_value: s@1 : &r@0 mut (i32)
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> s@1 : &r@0 mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    proj_loans (s@1 : &r@0 mut (i32))
-  }
-  None -> 1: i32 ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> &mut@1 (s@2 : i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
-  None -> 1: i32 ;
-}
-
+move l
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := &b;
-  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
-  var@8 := copy *(x);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
+  var@6 := move split_list<i32>(move var@7);
+  hd := copy (var@6).0;
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
@@ -124537,25 +122544,23 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> &mut@1 (1: i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := &b
+  var@6 := move split_list<i32>(move var@7)
 ]
 
 **Context**:
@@ -124565,209 +122570,129 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> &mut@1 (1: i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] end borrow: 0:
-- original context:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> &mut@1 (1: i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
+  Some (var@7) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
-[Debug] end_abstraction: 0
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> &mut@1 (1: i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
-}
 
-[Debug] end_abstraction: 0
-- context after parent abstractions ended:
-# Ended regions: {}
-# 1 frame(s)
+- op:
+move var@7
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> &mut@1 (1: i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
-}
+[Debug] 
+**About to evaluate statement**: [
+  hd := copy (var@6).0;
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
+  return
+]
 
-[Debug] end borrow: 1:
-- original context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> &mut@1 (1: i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> s@1 : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
-[Debug] give_back:
-- bid: 1
-- content: &mut@1 (1: i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
-}
 
+[Debug] 
+**About to evaluate statement**: [
+  hd := copy (var@6).0
+]
 
-[Debug] give_back_value:
-- bid: 1
-- value: 1: i32
-- context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> s@1 : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
-[Debug] end_abstraction: 0
-- context after loans ended:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> s@1 : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
-[Debug] give_back_value:
-- bid: 0
-- value: s@3 : std::boxed::Box<i32>
-- context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    ⊥ : &r@0 mut (std::boxed::Box<i32>),
-    @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }
-  }
-}
+- op:
+copy (var@6).0
 
+[Debug] expand_symbolic_value: s@1 : (i32, test1::List<i32>)
 
-[Debug] end_abstraction: 0
 - original context:
 # Ended regions: {}
 # 1 frame(s)
@@ -124775,821 +122700,711 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⌊mut@0⌋ ;
-  Some (x) -> &mut@1 (1: i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@0 (proj_borrows (s@0 : std::boxed::Box<i32> <: std::boxed::Box<i32>)),
-    ⌊mut@1, proj_loans (s@2 : i32)⌋
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> s@1 : (i32, test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 - new context:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> s@3 : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> ⊥ : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, s@3 : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
+
 [Debug] 
 **About to evaluate statement**: [
-  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5);
-  var@8 := copy *(x);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
+  tl := move (var@6).1;
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⌊shared@2⌋ ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, s@3 : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  x := move core::ops::deref::Deref<Box<i32>>::deref(move var@5)
+  tl := move (var@6).1
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⌊shared@2⌋ ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, s@3 : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_non_local_function_call:
-- fid:CfimAst.BoxDeref
-- type_params: [i32]
-- args: [move var@5]
-- dest: x
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⌊shared@2⌋ ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, s@3 : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@5
+move (var@6).1
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := copy *(x);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
+  var@10 := copy hd;
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> s@4 : &r@1 (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    proj_loans (s@4 : &r@1 (i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := copy *(x)
+  var@10 := copy hd
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> s@4 : &r@1 (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    proj_loans (s@4 : &r@1 (i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> s@4 : &r@1 (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    proj_loans (s@4 : &r@1 (i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy *(x)
-
-[Debug] expand_symbolic_value: s@4 : &r@1 (i32)
-
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> s@4 : &r@1 (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    proj_loans (s@4 : &r@1 (i32))
-  }
-}
-
-
-- new context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
-}
-
+copy hd
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
+  var@9 := move var@10 == 0: i32;
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@5 : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> s@2 : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := move var@8 == 1: i32
+  var@9 := move var@10 == 0: i32
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@5 : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> s@2 : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@5 : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> s@2 : i32 ;
 }
 
 
 - op:
-move var@8
+move var@10
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 - op:
-1: i32
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  drop(b);
+  var@8 := ¬ move var@9;
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@6 : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> s@4 : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := ¬ move var@7
+  var@8 := ¬ move var@9
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@6 : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> s@4 : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@6 : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> s@4 : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@7
+move var@9
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@6);
-  drop(b);
+  assert(¬move var@8);
+  drop(tl);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> s@7 : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> s@5 : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@6)
+  assert(¬move var@8)
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> s@7 : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> s@5 : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> true ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> true ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@6
+move var@8
 
 [Debug] 
 **About to evaluate statement**: [
-  drop(b);
+  drop(tl);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  drop(b)
+  drop(tl)
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> s@3 : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] drop_value: place: b
-[Debug] end borrow: 2:
-- original context:
-# Ended regions: {0}
+[Debug] drop_value: place: tl
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
-  }
-  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (l) -> ⊥ : test1::List<i32> ;
+  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
+  Some (var@3) -> ⊥ : test1::List<i32> ;
+  Some (hd) -> s@2 : i32 ;
+  Some (tl) -> ⊥ : test1::List<i32> ;
+  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
+  Some (var@7) -> ⊥ : test1::List<i32> ;
+  Some (var@8) -> ⊥ : bool ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 2: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 1)
-[Debug] end_abstraction: 1
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+
+[Debug] test_function_symbolic: get_elem
+[Debug] 
+**About to evaluate statement**: [
+  var@4 := copy b;
+  if (move var@4) {
+    var@0 := &mut *(x)
   }
-  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-}
+  else {
+    var@0 := move y
+  };
+  return
+]
 
-[Debug] end_abstraction: 1
-- context after parent abstractions ended:
-# Ended regions: {0}
+**Context**:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : bool),
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
   }
-  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> s@0 : bool ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
-[Debug] end borrow: 3:
-- original context:
-# Ended regions: {0}
+
+
+[Debug] 
+**About to evaluate statement**: [
+  var@4 := copy b
+]
+
+**Context**:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : bool),
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
   }
-  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> s@0 : bool ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
-[Debug] give_back:
-- bid: 3
-- content: ⌊shared@3⌋
-- context:
-# Ended regions: {0}
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : bool),
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
   }
-  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> s@0 : bool ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
 
-[Debug] end_abstraction: 1
-- context after loans ended:
-# Ended regions: {0}
-# 1 frame(s)
+- op:
+copy b
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @ended_shared_loan(s@5 : i32, proj_loans (s@5 : i32))
+[Debug] 
+**About to evaluate statement**: [
+  if (move var@4) {
+    var@0 := &mut *(x)
   }
-  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
-}
+  else {
+    var@0 := move y
+  };
+  return
+]
 
-[Debug] end_abstraction: 1
-- original context:
-# Ended regions: {0}
+**Context**:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⌊shared@3⌋ ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    ⌊shared@2⌋,
-    @shared_loan({3}, s@5 : i32, proj_loans (s@5 : i32))
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : bool),
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
   }
-  None -> @shared_loan({2}, s@3 : std::boxed::Box<i32>) ;
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> s@0 : bool ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> s@0 : bool ;
 }
 
 
-- new context:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  None -> s@3 : std::boxed::Box<i32> ;
-}
 
 [Debug] 
 **About to evaluate statement**: [
-  return
+  if (move var@4) {
+    var@0 := &mut *(x)
+  }
+  else {
+    var@0 := move y
+  }
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (b) -> ⊥ : std::boxed::Box<i32> ;
-  Some (x) -> ⊥ : &'_ mut (i32) ;
-  Some (var@3) -> ⊥ : &'_ mut (std::boxed::Box<i32>) ;
-  Some (x) -> ⊥ : &'_ (i32) ;
-  Some (var@5) -> ⊥ : &'_ (std::boxed::Box<i32>) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : bool),
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> s@0 : bool ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> s@0 : bool ;
 }
 
 
 
-[Debug] test_function_symbolic: copy_int
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := copy x;
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> true ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> true ;
 }
 
 
+- op:
+move var@4
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := copy x
+  var@0 := &mut *(x)
 ]
 
 **Context**:
@@ -125598,81 +123413,86 @@ move var@6
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> true ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] expand_symbolic_value: s@1 : &r@0 mut (T)
+
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : i32 ;
-  Some (x) -> s@0 : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> true ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
 
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
+- new context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> s@0 : i32 ;
-  Some (x) -> s@0 : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    ⌊mut@0, proj_loans (s@3 : T)⌋,
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> true ;
+  Some (x) -> &mut@0 (s@3 : T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
 
-
-[Debug] test_function_symbolic: test_copy_int
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: i32;
-  px := &x;
-  var@4 := copy x;
-  y := move copy_int(move var@4);
-  var@7 := copy *(px);
-  var@8 := copy y;
-  var@6 := move var@7 == move var@8;
-  var@5 := ¬ move var@6;
-  assert(¬move var@5);
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ (i32) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
-  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    false,
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> false ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> false ;
 }
 
 
+- op:
+move var@4
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32
+  var@0 := move y
 ]
 
 **Context**:
@@ -125681,15 +123501,16 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ (i32) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
-  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    false,
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> false ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
 
@@ -125701,31 +123522,24 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ (i32) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
-  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    false,
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (T) ;
+  Some (b) -> false ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
 
 - op:
-0: i32
+move y
 
 [Debug] 
 **About to evaluate statement**: [
-  px := &x;
-  var@4 := copy x;
-  y := move copy_int(move var@4);
-  var@7 := copy *(px);
-  var@8 := copy y;
-  var@6 := move var@7 == move var@8;
-  var@5 := ¬ move var@6;
-  assert(¬move var@5);
   return
 ]
 
@@ -125735,22 +123549,23 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ (i32) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
-  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    ⌊mut@0, proj_loans (s@3 : T)⌋,
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> &mut@1 (s@3 : T) ;
+  Some (b) -> true ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (y) -> s@2 : &r@0 mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  px := &x
+  return
 ]
 
 **Context**:
@@ -125759,28 +123574,44 @@ copy x
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ (i32) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
-  Some (var@8) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    false,
+    proj_loans (s@1 : &r@0 mut (T)),
+    proj_loans (s@2 : &r@0 mut (T))
+  }
+  Some (var@0) -> s@2 : &r@0 mut (T) ;
+  Some (b) -> false ;
+  Some (x) -> s@1 : &r@0 mut (T) ;
+  Some (y) -> ⊥ : &'_ mut (T) ;
+  Some (var@4) -> ⊥ : bool ;
 }
 
 
 
+[Debug] test_function_symbolic: get_elem_test
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy x;
-  y := move copy_int(move var@4);
-  var@7 := copy *(px);
-  var@8 := copy y;
-  var@6 := move var@7 == move var@8;
-  var@5 := ¬ move var@6;
-  assert(¬move var@5);
+  x := 0: i32;
+  y := 0: i32;
+  var@5 := &mut x;
+  var@4 := &two-phase *(var@5);
+  var@7 := &mut y;
+  var@6 := &two-phase *(var@7);
+  z := move get_elem<i32>(true, move var@4, move var@6);
+  var@8 := copy *(z);
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -125791,21 +123622,31 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
+  Some (x) -> ⊥ : i32 ;
   Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy x
+  x := 0: i32
 ]
 
 **Context**:
@@ -125815,14 +123656,24 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
+  Some (x) -> ⊥ : i32 ;
   Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -125835,28 +123686,52 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
+  Some (x) -> ⊥ : i32 ;
   Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy x
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  y := move copy_int(move var@4);
-  var@7 := copy *(px);
-  var@8 := copy y;
-  var@6 := move var@7 == move var@8;
-  var@5 := ¬ move var@6;
-  assert(¬move var@5);
+  y := 0: i32;
+  var@5 := &mut x;
+  var@4 := &two-phase *(var@5);
+  var@7 := &mut y;
+  var@6 := &two-phase *(var@7);
+  z := move get_elem<i32>(true, move var@4, move var@6);
+  var@8 := copy *(z);
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -125867,21 +123742,31 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
+  Some (x) -> 0: i32 ;
   Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> 0: i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  y := move copy_int(move var@4)
+  y := 0: i32
 ]
 
 **Context**:
@@ -125891,14 +123776,24 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
+  Some (x) -> 0: i32 ;
   Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> 0: i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
@@ -125911,27 +123806,51 @@ copy x
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
+  Some (x) -> 0: i32 ;
   Some (y) -> ⊥ : i32 ;
-  Some (var@4) -> 0: i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@4
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := copy *(px);
-  var@8 := copy y;
-  var@6 := move var@7 == move var@8;
-  var@5 := ¬ move var@6;
-  assert(¬move var@5);
+  var@5 := &mut x;
+  var@4 := &two-phase *(var@5);
+  var@7 := &mut y;
+  var@6 := &two-phase *(var@7);
+  z := move get_elem<i32>(true, move var@4, move var@6);
+  var@8 := copy *(z);
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -125942,21 +123861,31 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 0: i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := copy *(px)
+  var@5 := &mut x
 ]
 
 **Context**:
@@ -125966,47 +123895,83 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> 0: i32 ;
+  Some (y) -> 0: i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@4 := &two-phase *(var@5);
+  var@7 := &mut y;
+  var@6 := &two-phase *(var@7);
+  z := move get_elem<i32>(true, move var@4, move var@6);
+  var@8 := copy *(z);
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> 0: i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (0: i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-copy *(px)
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := copy y;
-  var@6 := move var@7 == move var@8;
-  var@5 := ¬ move var@6;
-  assert(¬move var@5);
-  return
+  var@4 := &two-phase *(var@5)
 ]
 
 **Context**:
@@ -126016,21 +123981,48 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> 0: i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> 0: i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (0: i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := copy y
+  var@7 := &mut y;
+  var@6 := &two-phase *(var@7);
+  z := move get_elem<i32>(true, move var@4, move var@6);
+  var@8 := copy *(z);
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
 ]
 
 **Context**:
@@ -126040,45 +124032,80 @@ copy *(px)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> 0: i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> 0: i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
+  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@7 := &mut y
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> 0: i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> 0: i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
+  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-copy y
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := move var@7 == move var@8;
-  var@5 := ¬ move var@6;
-  assert(¬move var@5);
+  var@6 := &two-phase *(var@7);
+  z := move get_elem<i32>(true, move var@4, move var@6);
+  var@8 := copy *(z);
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -126089,21 +124116,31 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> 0: i32 ;
-  Some (var@8) -> s@0 : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
+  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (0: i32) ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := move var@7 == move var@8
+  var@6 := &two-phase *(var@7)
 ]
 
 **Context**:
@@ -126113,66 +124150,45 @@ copy y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> 0: i32 ;
-  Some (var@8) -> s@0 : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> 0: i32 ;
-  Some (var@8) -> s@0 : i32 ;
-}
-
-
-- op:
-move var@7
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
-  Some (var@8) -> s@0 : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
+  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (0: i32) ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-- op:
-move var@8
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := ¬ move var@6;
-  assert(¬move var@5);
+  z := move get_elem<i32>(true, move var@4, move var@6);
+  var@8 := copy *(z);
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -126183,21 +124199,31 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> s@1 : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
+  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
+  Some (var@6) -> ⌊inactivated_mut@3⌋ ;
+  Some (var@7) -> &mut@2 (@shared_loan({3}, 0: i32)) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := ¬ move var@6
+  z := move get_elem<i32>(true, move var@4, move var@6)
 ]
 
 **Context**:
@@ -126207,18 +124233,32 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> s@1 : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
+  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
+  Some (var@6) -> ⌊inactivated_mut@3⌋ ;
+  Some (var@7) -> &mut@2 (@shared_loan({3}, 0: i32)) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
+[Debug] activate_inactivated_mut_borrow: resulting value:
+0: i32
+[Debug] activate_inactivated_mut_borrow: resulting value:
+0: i32
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -126227,68 +124267,61 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> s@1 : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> &mut@1 (0: i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> &mut@3 (0: i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@6
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@5);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> s@2 : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
-  Some (var@8) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@5)
-]
+true
 
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> s@2 : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> &mut@1 (0: i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> &mut@3 (0: i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
+- op:
+move var@4
 
 [Debug] eval_operand:
 - ctx:
@@ -126298,22 +124331,46 @@ move var@6
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> true ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> &mut@3 (0: i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@5
+move var@6
 
 [Debug] 
 **About to evaluate statement**: [
+  var@8 := copy *(z);
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -126324,34 +124381,37 @@ move var@5
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> @shared_loan({0}, 0: i32) ;
-  Some (px) -> ⌊shared@0⌋ ;
-  Some (y) -> s@0 : i32 ;
-  Some (var@4) -> ⊥ : i32 ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> s@0 : &r@0 mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
   Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    proj_loans (s@0 : &r@0 mut (i32))
+  }
 }
 
 
 
-[Debug] test_function_symbolic: is_cons
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := discriminant(*(l));
-  switch (move var@2) {
-    0: isize => {
-      var@0 := true
-    }
-    1: isize => {
-      var@0 := false
-    }
-    _ => {
-      panic
-    }
-  };
-  return
+  var@8 := copy *(z)
 ]
 
 **Context**:
@@ -126360,38 +124420,74 @@ move var@5
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> s@0 : &r@0 mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 (test1::List<T>))
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    proj_loans (s@0 : &r@0 mut (i32))
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> s@0 : &r@0 (test1::List<T>) ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := discriminant(*(l))
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> s@0 : &r@0 mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 (test1::List<T>))
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    proj_loans (s@0 : &r@0 mut (i32))
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> s@0 : &r@0 (test1::List<T>) ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
+- op:
+copy *(z)
 
-[Debug] expand_symbolic_value: s@0 : &r@0 (test1::List<T>)
+[Debug] expand_symbolic_value: s@0 : &r@0 mut (i32)
 
 - original context:
 # Ended regions: {}
@@ -126399,12 +124495,31 @@ move var@5
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> s@0 : &r@0 mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 (test1::List<T>))
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    proj_loans (s@0 : &r@0 mut (i32))
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> s@0 : &r@0 (test1::List<T>) ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
@@ -126414,28 +124529,49 @@ move var@5
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@1 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, s@1 : test1::List<T>, proj_loans (s@1 : test1::List<T>))
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
 [Debug] 
 **About to evaluate statement**: [
-  switch (move var@2) {
-    0: isize => {
-      var@0 := true
-    }
-    1: isize => {
-      var@0 := false
-    }
-    _ => {
-      panic
-    }
-  };
+  *(z) := copy var@8 + 1: i32;
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -126445,29 +124581,38 @@ move var@5
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@1 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> 0: isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  switch (move var@2) {
-    0: isize => {
-      var@0 := true
-    }
-    1: isize => {
-      var@0 := false
-    }
-    _ => {
-      panic
-    }
-  }
+  *(z) := copy var@8 + 1: i32
 ]
 
 **Context**:
@@ -126476,12 +124621,31 @@ move var@5
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@1 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> 0: isize ;
 }
 
 
@@ -126493,38 +124657,36 @@ move var@5
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@1 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> 0: isize ;
 }
 
 
 - op:
-move var@2
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := true
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
-  }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> ⊥ : isize ;
-}
-
-
+copy var@8
 
 [Debug] eval_operand:
 - ctx:
@@ -126533,20 +124695,51 @@ move var@2
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@1 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
 - op:
-true
+1: i32
 
 [Debug] 
 **About to evaluate statement**: [
+  var@12 := copy *(z);
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -126556,30 +124749,38 @@ true
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Cons { 0 = s@2 : T; 1 = s@3 : std::boxed::Box<test1::List<T>>; }, test1::List::Cons { 0 = proj_loans (s@2 : T); 1 = proj_loans (s@3 : std::boxed::Box<test1::List<T>>); })
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> true ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  switch (move var@2) {
-    0: isize => {
-      var@0 := true
-    }
-    1: isize => {
-      var@0 := false
-    }
-    _ => {
-      panic
-    }
-  };
-  return
+  var@12 := copy *(z)
 ]
 
 **Context**:
@@ -126588,69 +124789,127 @@ true
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> 1: isize ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  switch (move var@2) {
-    0: isize => {
-      var@0 := true
-    }
-    1: isize => {
-      var@0 := false
-    }
-    _ => {
-      panic
-    }
-  }
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> 1: isize ;
 }
 
 
+- op:
+copy *(z)
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@11 := move var@12 == 1: i32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> s@2 : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> 1: isize ;
 }
 
 
-- op:
-move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := false
+  var@11 := move var@12 == 1: i32
 ]
 
 **Context**:
@@ -126659,12 +124918,31 @@ move var@2
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> s@2 : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
@@ -126676,53 +124954,87 @@ move var@2
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> s@2 : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> ⊥ : bool ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
 - op:
-false
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
+move var@12
 
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    @shared_loan({0}, test1::List::Nil, test1::List::Nil)
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
-  Some (var@0) -> false ;
-  Some (l) -> ⌊shared@0⌋ ;
-  Some (var@2) -> ⊥ : isize ;
 }
 
 
+- op:
+1: i32
 
-[Debug] test_function_symbolic: test_is_cons
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(var@3, 1);
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  var@7 := &l;
-  var@6 := copy var@7;
-  var@5 := move is_cons<i32>(move var@6);
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -126733,20 +125045,37 @@ false
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@3 : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(var@3, 1)
+  var@10 := ¬ move var@11
 ]
 
 **Context**:
@@ -126756,78 +125085,34 @@ false
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  var@7 := &l;
-  var@6 := copy var@7;
-  var@5 := move is_cons<i32>(move var@6);
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@3 : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
 
-[Debug] eval_non_local_function_call:
-- fid:CfimAst.BoxNew
-- type_params: [test1::List<i32>]
-- args: [move var@3]
-- dest: var@2
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -126836,30 +125121,47 @@ false
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@3 : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
 - op:
-move var@3
+move var@11
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  var@7 := &l;
-  var@6 := copy var@7;
-  var@5 := move is_cons<i32>(move var@6);
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
+  assert(¬move var@10);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -126870,20 +125172,37 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> s@4 : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).0 := 0: i32
+  assert(¬move var@10)
 ]
 
 **Context**:
@@ -126893,13 +125212,30 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> s@4 : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
@@ -126912,32 +125248,46 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> true ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
 - op:
-0: i32
+move var@10
 
-[Debug] expand_bottom_value_from_projection:
-pe: (Expressions.Field ((Expressions.ProjAdt (1, (Some 0))), 0))
-ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  var@7 := &l;
-  var@6 := copy var@7;
-  var@5 := move is_cons<i32>(move var@6);
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
+  var@15 := copy x;
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -126948,20 +125298,37 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).1 := move var@2
+  var@15 := copy x
 ]
 
 **Context**:
@@ -126971,13 +125338,30 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
@@ -126990,664 +125374,1091 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
 - op:
-move var@2
-
-[Debug] 
-**About to evaluate statement**: [
-  set_discriminant(l, 0);
-  var@7 := &l;
-  var@6 := copy var@7;
-  var@5 := move is_cons<i32>(move var@6);
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
-  return
-]
+copy x
 
-**Context**:
+[Debug] end borrow: 0:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  set_discriminant(l, 0)
-]
-
-**Context**:
+[Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 1))
+[Debug] end borrow: 1:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := &l;
-  var@6 := copy var@7;
-  var@5 := move is_cons<i32>(move var@6);
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
-  return
-]
-
-**Context**:
+[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
+[Debug] end_abstraction: 0
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := &l
-]
-
-**Context**:
+[Debug] end_abstraction: 0
+- context after parent abstractions ended:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@6 := copy var@7;
-  var@5 := move is_cons<i32>(move var@6);
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
-  return
-]
-
-**Context**:
+[Debug] end borrow: 4:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@6 := copy var@7
-]
-
-**Context**:
+[Debug] give_back:
+- bid: 4
+- content: &mut@4 (s@2 : i32)
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
-
-[Debug] eval_operand:
-- ctx:
+[Debug] give_back_value:
+- bid: 4
+- value: s@2 : i32
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
+  }
 }
 
 
-- op:
-copy var@7
-
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := move is_cons<i32>(move var@6);
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
-  return
-]
-
-**Context**:
+[Debug] end_abstraction: 0
+- context after loans ended:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⌊shared@1⌋ ;
-  Some (var@7) -> ⌊shared@0⌋ ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    @ended_mut_loan{ given_back=proj_borrows (s@2 : i32 <: i32); child=proj_loans (s@1 : i32) }
+  }
 }
 
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := move is_cons<i32>(move var@6)
-]
-
-**Context**:
+[Debug] give_back_value:
+- bid: 1
+- value: s@5 : i32
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⌊shared@1⌋ ;
-  Some (var@7) -> ⌊shared@0⌋ ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    ⊥ : &r@0 mut (i32),
+    &mut@3 (0: i32),
+    @ended_mut_loan{ given_back=proj_borrows (s@2 : i32 <: i32); child=proj_loans (s@1 : i32) }
+  }
 }
 
 
-
-[Debug] eval_operand:
-- ctx:
+[Debug] give_back_value:
+- bid: 3
+- value: s@6 : i32
+- context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⌊shared@1⌋ ;
-  Some (var@7) -> ⌊shared@0⌋ ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (s@5 : i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    true,
+    ⊥ : &r@0 mut (i32),
+    ⊥ : &r@0 mut (i32),
+    @ended_mut_loan{ given_back=proj_borrows (s@2 : i32 <: i32); child=proj_loans (s@1 : i32) }
+  }
 }
 
 
-- op:
-move var@6
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := ¬ move var@5;
-  assert(¬move var@4);
-  drop(l);
-  return
-]
-
-**Context**:
+[Debug] end_abstraction: 0
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> s@1 : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> &mut@4 (s@2 : i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
+    true,
+    &mut@1 (0: i32),
+    &mut@3 (0: i32),
+    ⌊mut@4, proj_loans (s@1 : i32)⌋
   }
 }
 
 
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := ¬ move var@5
-]
-
-**Context**:
-# Ended regions: {}
+- new context:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> s@1 : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (s@5 : i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
+[Debug] end borrow: 0:
+- original context:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> s@1 : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> &mut@0 (s@5 : i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
+[Debug] give_back:
+- bid: 0
+- content: &mut@0 (s@5 : i32)
+- context:
+# Ended regions: {0}
+# 1 frame(s)
 
-- op:
-move var@5
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
 
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@4);
-  drop(l);
-  return
-]
 
-**Context**:
-# Ended regions: {}
+[Debug] give_back_value:
+- bid: 0
+- value: s@5 : i32
+- context:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> s@2 : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@4)
+  var@14 := move var@15 == 1: i32;
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> s@2 : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> s@5 : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
+[Debug] 
+**About to evaluate statement**: [
+  var@14 := move var@15 == 1: i32
+]
+
+**Context**:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> true ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> s@5 : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {0}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> s@5 : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@4
+move var@15
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {0}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+- op:
+1: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  drop(l);
+  var@13 := ¬ move var@14;
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> s@7 : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  drop(l)
+  var@13 := ¬ move var@14
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> s@7 : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] drop_value: place: l
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {}
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⌊shared@0⌋ ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
-  None -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> s@7 : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
-[Debug] give_back:
-- bid: 0
-- content: ⌊shared@0⌋
-- context:
-# Ended regions: {}
+
+- op:
+move var@14
+
+[Debug] 
+**About to evaluate statement**: [
+  assert(¬move var@13);
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
+]
+
+**Context**:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
-  None -> @shared_loan({0, 1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> s@8 : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
-[Debug] end borrow: 1:
-- original context:
-# Ended regions: {}
+
+[Debug] 
+**About to evaluate statement**: [
+  assert(¬move var@13)
+]
+
+**Context**:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
-  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> s@8 : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
-[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
-[Debug] end_abstraction: 0
-- original context:
-# Ended regions: {}
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
-  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> true ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
-[Debug] end_abstraction: 0
-- context after parent abstractions ended:
-# Ended regions: {}
+
+- op:
+move var@13
+
+[Debug] 
+**About to evaluate statement**: [
+  var@18 := copy y;
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
+]
+
+**Context**:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
-  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
-[Debug] end_abstraction: 0
-- context after loans ended:
-# Ended regions: {}
+
+
+[Debug] 
+**About to evaluate statement**: [
+  var@18 := copy y
+]
+
+**Context**:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
-  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
-[Debug] end_abstraction: 0
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {0}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+- op:
+copy y
+
+[Debug] end borrow: 2:
 - original context:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-  abs@0{parents={}}{regions={0}} {
-    ⌊shared@1⌋,
-    proj_loans (s@1 : bool)
-  }
-  None -> @shared_loan({1}, test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; }) ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> &mut@2 (s@6 : i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
+[Debug] give_back:
+- bid: 2
+- content: &mut@2 (s@6 : i32)
+- context:
+# Ended regions: {0}
+# 1 frame(s)
 
-- new context:
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
+}
+
+
+[Debug] give_back_value:
+- bid: 2
+- value: s@6 : i32
+- context:
 # Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
-  None -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> ⌊mut@2⌋ ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
+
 [Debug] 
 **About to evaluate statement**: [
+  var@17 := move var@18 == 0: i32;
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
   return
 ]
 
@@ -127658,353 +126469,369 @@ move var@4
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (var@4) -> ⊥ : bool ;
-  Some (var@5) -> ⊥ : bool ;
-  Some (var@6) -> ⊥ : &'_ (test1::List<i32>) ;
-  Some (var@7) -> ⊥ : &'_ (test1::List<i32>) ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> s@6 : i32 ;
 }
 
 
 
-[Debug] test_function_symbolic: split_list
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := false;
-  var@7 := false;
-  var@7 := true;
-  var@8 := true;
-  var@2 := discriminant(l);
-  switch (move var@2) {
-    0: isize => {
-      var@8 := false;
-      hd := move (l as test1::List::Cons).0;
-      var@7 := false;
-      tl := move (l as test1::List::Cons).1;
-      var@5 := move hd;
-      var@6 := move deref_box(tl);
-      (var@0).0 := move var@5;
-      (var@0).1 := move var@6;
-      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
-      return
-    }
-    _ => {
-      panic
-    }
-  }
+  var@17 := move var@18 == 0: i32
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> s@6 : i32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := false
-]
-
-**Context**:
-# Ended regions: {}
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> s@6 : i32 ;
 }
 
 
+- op:
+move var@18
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-false
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := false;
-  var@7 := true;
-  var@8 := true;
-  var@2 := discriminant(l);
-  switch (move var@2) {
-    0: isize => {
-      var@8 := false;
-      hd := move (l as test1::List::Cons).0;
-      var@7 := false;
-      tl := move (l as test1::List::Cons).1;
-      var@5 := move hd;
-      var@6 := move deref_box(tl);
-      (var@0).0 := move var@5;
-      (var@0).1 := move var@6;
-      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
-      return
-    }
-    _ => {
-      panic
-    }
-  }
+  var@16 := ¬ move var@17;
+  assert(¬move var@16);
+  return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> s@9 : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := false
+  var@16 := ¬ move var@17
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> s@9 : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> s@9 : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-false
+move var@17
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := true;
-  var@8 := true;
-  var@2 := discriminant(l);
-  switch (move var@2) {
-    0: isize => {
-      var@8 := false;
-      hd := move (l as test1::List::Cons).0;
-      var@7 := false;
-      tl := move (l as test1::List::Cons).1;
-      var@5 := move hd;
-      var@6 := move deref_box(tl);
-      (var@0).0 := move var@5;
-      (var@0).1 := move var@6;
-      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
-      return
-    }
-    _ => {
-      panic
-    }
-  }
+  assert(¬move var@16);
+  return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> s@10 : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := true
+  assert(¬move var@16)
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> s@10 : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> true ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 - op:
-true
+move var@16
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := true;
-  var@2 := discriminant(l);
-  switch (move var@2) {
-    0: isize => {
-      var@8 := false;
-      hd := move (l as test1::List::Cons).0;
-      var@7 := false;
-      tl := move (l as test1::List::Cons).1;
-      var@5 := move hd;
-      var@6 := move deref_box(tl);
-      (var@0).0 := move var@5;
-      (var@0).1 := move var@6;
-      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
-      return
-    }
-    _ => {
-      panic
-    }
-  }
+  return
 ]
 
 **Context**:
-# Ended regions: {}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@5 : i32 ;
+  Some (y) -> s@6 : i32 ;
+  Some (z) -> ⊥ : &'_ mut (i32) ;
+  Some (var@4) -> ⊥ : &'_ mut (i32) ;
+  Some (var@5) -> ⊥ : &'_ mut (i32) ;
+  Some (var@6) -> ⊥ : &'_ mut (i32) ;
+  Some (var@7) -> ⊥ : &'_ mut (i32) ;
+  Some (var@8) -> s@1 : i32 ;
+  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : i32 ;
+  Some (var@13) -> ⊥ : bool ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : bool ;
+  Some (var@17) -> ⊥ : bool ;
+  Some (var@18) -> ⊥ : i32 ;
 }
 
 
 
+[Debug] test_function_symbolic: id_mut_mut
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := true
+  var@2 := &mut *(x);
+  var@0 := &mut *(var@2);
+  return
 ]
 
 **Context**:
@@ -128013,91 +126840,85 @@ true
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
+  }
+  abs@1{parents={0}}{regions={1}} {
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
+  Some (x) -> s@0 : &r@0 mut (&r@1 mut (T)) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (T)) ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@2 := &mut *(x)
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
+  }
+  abs@1{parents={0}}{regions={1}} {
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
+  Some (x) -> s@0 : &r@0 mut (&r@1 mut (T)) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (T)) ;
 }
 
 
-- op:
-true
 
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := discriminant(l);
-  switch (move var@2) {
-    0: isize => {
-      var@8 := false;
-      hd := move (l as test1::List::Cons).0;
-      var@7 := false;
-      tl := move (l as test1::List::Cons).1;
-      var@5 := move hd;
-      var@6 := move deref_box(tl);
-      (var@0).0 := move var@5;
-      (var@0).1 := move var@6;
-      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
-      return
-    }
-    _ => {
-      panic
-    }
-  }
-]
+[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@1 mut (T))
 
-**Context**:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
+  }
+  abs@1{parents={0}}{regions={1}} {
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
+  Some (x) -> s@0 : &r@0 mut (&r@1 mut (T)) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (T)) ;
 }
 
 
+- new context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@1 mut (T))⌋
+  }
+  abs@1{parents={0}}{regions={1}} {
+    @ignored_mut_loan(0, proj_loans (s@1 : &r@1 mut (T)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
+  Some (x) -> &mut@0 (s@1 : &r@1 mut (T)) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (T)) ;
+}
+
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := discriminant(l)
+  var@0 := &mut *(var@2);
+  return
 ]
 
 **Context**:
@@ -128106,40 +126927,22 @@ true
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> s@0 : test1::List<T> ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@1 mut (T))⌋
+  }
+  abs@1{parents={0}}{regions={1}} {
+    @ignored_mut_loan(0, proj_loans (s@1 : &r@1 mut (T)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (s@1 : &r@1 mut (T)) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  switch (move var@2) {
-    0: isize => {
-      var@8 := false;
-      hd := move (l as test1::List::Cons).0;
-      var@7 := false;
-      tl := move (l as test1::List::Cons).1;
-      var@5 := move hd;
-      var@6 := move deref_box(tl);
-      (var@0).0 := move var@5;
-      (var@0).1 := move var@6;
-      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
-      return
-    }
-    _ => {
-      panic
-    }
-  }
+  var@0 := &mut *(var@2)
 ]
 
 **Context**:
@@ -128148,56 +126951,48 @@ true
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> 0: isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@1 mut (T))⌋
+  }
+  abs@1{parents={0}}{regions={1}} {
+    @ignored_mut_loan(0, proj_loans (s@1 : &r@1 mut (T)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (s@1 : &r@1 mut (T)) ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> 0: isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@1 mut (T))⌋
+  }
+  abs@1{parents={0}}{regions={1}} {
+    @ignored_mut_loan(0, proj_loans (s@1 : &r@1 mut (T)))
+  }
+  Some (var@0) -> &mut@2 (s@1 : &r@1 mut (T)) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (⌊mut@2⌋) ;
 }
 
 
-- op:
-move var@2
 
+[Debug] test_function_symbolic: id_mut_pair
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := false;
-  hd := move (l as test1::List::Cons).0;
-  var@7 := false;
-  tl := move (l as test1::List::Cons).1;
-  var@5 := move hd;
-  var@6 := move deref_box(tl);
-  (var@0).0 := move var@5;
-  (var@0).1 := move var@6;
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  var@2 := &mut *(x);
+  var@0 := &mut *(var@2);
   return
 ]
 
@@ -128207,24 +127002,19 @@ move var@2
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (T), u32)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
+  Some (x) -> s@0 : &r@0 mut ((&r@0 mut (T), u32)) ;
+  Some (var@2) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := false
+  var@2 := &mut *(x)
 ]
 
 **Context**:
@@ -128233,55 +127023,51 @@ move var@2
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (T), u32)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
+  Some (x) -> s@0 : &r@0 mut ((&r@0 mut (T), u32)) ;
+  Some (var@2) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] expand_symbolic_value: s@0 : &r@0 mut ((&r@0 mut (T), u32))
+
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (T), u32)))
+  }
+  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
+  Some (x) -> s@0 : &r@0 mut ((&r@0 mut (T), u32)) ;
+  Some (var@2) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
 }
 
 
-- op:
-false
+- new context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : (&r@0 mut (T), u32))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
+  Some (x) -> &mut@0 (s@1 : (&r@0 mut (T), u32)) ;
+  Some (var@2) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
+}
+
 
 [Debug] 
 **About to evaluate statement**: [
-  hd := move (l as test1::List::Cons).0;
-  var@7 := false;
-  tl := move (l as test1::List::Cons).1;
-  var@5 := move hd;
-  var@6 := move deref_box(tl);
-  (var@0).0 := move var@5;
-  (var@0).1 := move var@6;
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  var@0 := &mut *(var@2);
   return
 ]
 
@@ -128291,24 +127077,19 @@ false
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : (&r@0 mut (T), u32))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (s@1 : (&r@0 mut (T), u32)) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  hd := move (l as test1::List::Cons).0
+  var@0 := &mut *(var@2)
 ]
 
 **Context**:
@@ -128317,54 +127098,53 @@ false
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : (&r@0 mut (T), u32))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (s@1 : (&r@0 mut (T), u32)) ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = s@1 : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : (&r@0 mut (T), u32))⌋
+  }
+  Some (var@0) -> &mut@2 (s@1 : (&r@0 mut (T), u32)) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (⌊mut@2⌋) ;
 }
 
 
-- op:
-move (l as test1::List::Cons).0
 
+[Debug] test_function_symbolic: id_mut_pair_test1
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := false;
-  tl := move (l as test1::List::Cons).1;
-  var@5 := move hd;
-  var@6 := move deref_box(tl);
-  (var@0).0 := move var@5;
-  (var@0).1 := move var@6;
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  x := 0: u32;
+  px := &mut x;
+  var@4 := move px;
+  (p).0 := move var@4;
+  (p).1 := 1: u32;
+  pp0 := &mut p;
+  var@7 := &two-phase *(pp0);
+  pp1 := move id_mut_pair<u32>(move var@7);
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -128374,24 +127154,24 @@ move (l as test1::List::Cons).0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⊥ : u32 ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := false
+  x := 0: u32
 ]
 
 **Context**:
@@ -128400,17 +127180,17 @@ move (l as test1::List::Cons).0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⊥ : u32 ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
@@ -128422,31 +127202,37 @@ move (l as test1::List::Cons).0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⊥ : u32 ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 - op:
-false
+0: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  tl := move (l as test1::List::Cons).1;
-  var@5 := move hd;
-  var@6 := move deref_box(tl);
-  (var@0).0 := move var@5;
-  (var@0).1 := move var@6;
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  px := &mut x;
+  var@4 := move px;
+  (p).0 := move var@4;
+  (p).1 := 1: u32;
+  pp0 := &mut p;
+  var@7 := &two-phase *(pp0);
+  pp1 := move id_mut_pair<u32>(move var@7);
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -128456,24 +127242,24 @@ false
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: u32 ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  tl := move (l as test1::List::Cons).1
+  px := &mut x
 ]
 
 **Context**:
@@ -128482,52 +127268,34 @@ false
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = s@2 : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> 0: u32 ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
-- op:
-move (l as test1::List::Cons).1
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := move hd;
-  var@6 := move deref_box(tl);
-  (var@0).0 := move var@5;
-  (var@0).1 := move var@6;
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  var@4 := move px;
+  (p).0 := move var@4;
+  (p).1 := 1: u32;
+  pp0 := &mut p;
+  var@7 := &two-phase *(pp0);
+  pp1 := move id_mut_pair<u32>(move var@7);
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -128537,24 +127305,24 @@ move (l as test1::List::Cons).1
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> &mut@0 (0: u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := move hd
+  var@4 := move px
 ]
 
 **Context**:
@@ -128563,17 +127331,17 @@ move (l as test1::List::Cons).1
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> &mut@0 (0: u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
@@ -128585,29 +127353,35 @@ move (l as test1::List::Cons).1
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> s@1 : T ;
-  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> &mut@0 (0: u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 - op:
-move hd
+move px
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := move deref_box(tl);
-  (var@0).0 := move var@5;
-  (var@0).1 := move var@6;
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  (p).0 := move var@4;
+  (p).1 := 1: u32;
+  pp0 := &mut p;
+  var@7 := &two-phase *(pp0);
+  pp1 := move id_mut_pair<u32>(move var@7);
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -128617,24 +127391,24 @@ move hd
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> s@1 : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> &mut@0 (0: u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := move deref_box(tl)
+  (p).0 := move var@4
 ]
 
 **Context**:
@@ -128643,17 +127417,17 @@ move hd
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> s@1 : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> &mut@0 (0: u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
@@ -128665,70 +127439,40 @@ move hd
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> s@1 : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
+  Some (var@4) -> &mut@0 (0: u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 - op:
-move deref_box(tl)
-
-[Debug] expand_symbolic_value: s@2 : std::boxed::Box<test1::List<T>>
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> s@2 : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> s@1 : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(s@3 : test1::List<T>) ;
-  Some (var@5) -> s@1 : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
-}
-
+move var@4
 
+[Debug] expand_bottom_value_from_projection:
+pe: (Expressions.Field ((Expressions.ProjTuple 2), 0))
+ty: (Types.Adt (Types.Tuple, [],
+   [(Types.Ref (Types.Erased, (Types.Integer Types.U32), Types.Mut));
+     (Types.Integer Types.U32)]
+   ))
 [Debug] 
 **About to evaluate statement**: [
-  (var@0).0 := move var@5;
-  (var@0).1 := move var@6;
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  (p).1 := 1: u32;
+  pp0 := &mut p;
+  var@7 := &two-phase *(pp0);
+  pp1 := move id_mut_pair<u32>(move var@7);
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -128738,24 +127482,24 @@ move deref_box(tl)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(⊥ : test1::List<T>) ;
-  Some (var@5) -> s@1 : T ;
-  Some (var@6) -> s@3 : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> (&mut@0 (0: u32), ⊥ : u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (var@0).0 := move var@5
+  (p).1 := 1: u32
 ]
 
 **Context**:
@@ -128764,17 +127508,17 @@ move deref_box(tl)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(⊥ : test1::List<T>) ;
-  Some (var@5) -> s@1 : T ;
-  Some (var@6) -> s@3 : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> (&mut@0 (0: u32), ⊥ : u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
@@ -128786,33 +127530,33 @@ move deref_box(tl)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(⊥ : test1::List<T>) ;
-  Some (var@5) -> s@1 : T ;
-  Some (var@6) -> s@3 : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> (&mut@0 (0: u32), ⊥ : u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 - op:
-move var@5
+1: u32
 
-[Debug] expand_bottom_value_from_projection:
-pe: (Expressions.Field ((Expressions.ProjTuple 2), 0))
-ty: (Types.Adt (Types.Tuple, [],
-   [(Types.TypeVar 0); (Types.Adt ((Types.AdtId 1), [], [(Types.TypeVar 0)]))
-     ]
-   ))
 [Debug] 
 **About to evaluate statement**: [
-  (var@0).1 := move var@6;
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  pp0 := &mut p;
+  var@7 := &two-phase *(pp0);
+  pp1 := move id_mut_pair<u32>(move var@7);
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -128822,24 +127566,24 @@ ty: (Types.Adt (Types.Tuple, [],
 
 # Frame 0:
 {
-  Some (var@0) -> (s@1 : T, ⊥ : test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(⊥ : test1::List<T>) ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> s@3 : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> (&mut@0 (0: u32), 1: u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (var@0).1 := move var@6
+  pp0 := &mut p
 ]
 
 **Context**:
@@ -128848,48 +127592,30 @@ ty: (Types.Adt (Types.Tuple, [],
 
 # Frame 0:
 {
-  Some (var@0) -> (s@1 : T, ⊥ : test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(⊥ : test1::List<T>) ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> s@3 : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> (s@1 : T, ⊥ : test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(⊥ : test1::List<T>) ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> s@3 : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> (&mut@0 (0: u32), 1: u32) ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
-- op:
-move var@6
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
+  var@7 := &two-phase *(pp0);
+  pp1 := move id_mut_pair<u32>(move var@7);
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -128899,24 +127625,24 @@ move var@6
 
 # Frame 0:
 {
-  Some (var@0) -> (s@1 : T, s@3 : test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(⊥ : test1::List<T>) ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 ((&mut@0 (0: u32), 1: u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl)
+  var@7 := &two-phase *(pp0)
 ]
 
 **Context**:
@@ -128925,29 +127651,29 @@ move var@6
 
 # Frame 0:
 {
-  Some (var@0) -> (s@1 : T, s@3 : test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> @Box(⊥ : test1::List<T>) ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 ((&mut@0 (0: u32), 1: u32)) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
-[Debug] eval_non_local_function_call:
-- fid:CfimAst.BoxFree
-- type_params: [test1::List<T>]
-- args: [move tl]
-- dest: var@9
-[Debug] drop_value: place: tl
 [Debug] 
 **About to evaluate statement**: [
+  pp1 := move id_mut_pair<u32>(move var@7);
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -128957,40 +127683,24 @@ move var@6
 
 # Frame 0:
 {
-  Some (var@0) -> (s@1 : T, s@3 : test1::List<T>) ;
-  Some (l) -> test1::List::Cons { 0 = ⊥ : T; 1 = ⊥ : std::boxed::Box<test1::List<T>>; } ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> false ;
-  Some (var@8) -> false ;
-  Some (var@9) -> () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (@shared_loan({2}, (&mut@0 (0: u32), 1: u32))) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⌊inactivated_mut@2⌋ ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  switch (move var@2) {
-    0: isize => {
-      var@8 := false;
-      hd := move (l as test1::List::Cons).0;
-      var@7 := false;
-      tl := move (l as test1::List::Cons).1;
-      var@5 := move hd;
-      var@6 := move deref_box(tl);
-      (var@0).0 := move var@5;
-      (var@0).1 := move var@6;
-      var@9 := move alloc::alloc::box_free<test1::List<T>>(move tl);
-      return
-    }
-    _ => {
-      panic
-    }
-  }
+  pp1 := move id_mut_pair<u32>(move var@7)
 ]
 
 **Context**:
@@ -128999,21 +127709,23 @@ move var@6
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Nil ;
-  Some (var@2) -> 1: isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (@shared_loan({2}, (&mut@0 (0: u32), 1: u32))) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> ⌊inactivated_mut@2⌋ ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 
+[Debug] activate_inactivated_mut_borrow: resulting value:
+(&mut@0 (0: u32), 1: u32)
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -129021,26 +127733,31 @@ move var@6
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Nil ;
-  Some (var@2) -> 1: isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (var@7) -> &mut@2 ((&mut@0 (0: u32), 1: u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
 }
 
 
 - op:
-move var@2
+move var@7
 
 [Debug] 
 **About to evaluate statement**: [
-  panic
+  y := 2: u32;
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
+  return
 ]
 
 **Context**:
@@ -129049,39 +127766,28 @@ move var@2
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : (T, test1::List<T>) ;
-  Some (l) -> test1::List::Nil ;
-  Some (var@2) -> ⊥ : isize ;
-  Some (hd) -> ⊥ : T ;
-  Some (tl) -> ⊥ : std::boxed::Box<test1::List<T>> ;
-  Some (var@5) -> ⊥ : T ;
-  Some (var@6) -> ⊥ : test1::List<T> ;
-  Some (var@7) -> true ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : () ;
-  Some (var@10) -> ⊥ : isize ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
 
-[Debug] test_function_symbolic: test_split_list
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(var@3, 1);
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  var@7 := move l;
-  var@6 := move split_list<i32>(move var@7);
-  hd := copy (var@6).0;
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
-  return
+  y := 2: u32
 ]
 
 **Context**:
@@ -129091,23 +127797,59 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
+}
+
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⊥ : u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
+- op:
+2: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(var@3, 1)
+  var@10 := &mut y;
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
+  return
 ]
 
 **Context**:
@@ -129117,36 +127859,27 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> 2: u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3);
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  var@7 := move l;
-  var@6 := move split_list<i32>(move var@7);
-  hd := copy (var@6).0;
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
-  return
+  var@10 := &mut y
 ]
 
 **Context**:
@@ -129156,23 +127889,30 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> 2: u32 ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> ⊥ : &'_ mut (u32) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@2 := move alloc::boxed::Box<test1::List<i32>>::new(move var@3)
+  var@9 := &mut *(var@10);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
+  return
 ]
 
 **Context**:
@@ -129182,63 +127922,58 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (2: u32) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
 
-[Debug] eval_non_local_function_call:
-- fid:CfimAst.BoxNew
-- type_params: [test1::List<i32>]
-- args: [move var@3]
-- dest: var@2
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@9 := &mut *(var@10)
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> test1::List::Nil ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (2: u32) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
-- op:
-move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).0 := 0: i32;
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  var@7 := move l;
-  var@6 := move split_list<i32>(move var@7);
-  hd := copy (var@6).0;
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
+  *((pp1).0) := move var@9;
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -129249,23 +127984,27 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> &mut@4 (2: u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).0 := 0: i32
+  *((pp1).0) := move var@9
 ]
 
 **Context**:
@@ -129275,16 +128014,20 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> &mut@4 (2: u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
@@ -129297,38 +128040,133 @@ move var@3
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> &mut@4 (2: u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
 }
 
 
 - op:
-0: i32
+move var@9
+
+[Debug] expand_symbolic_value: s@0 : &r@0 mut ((&r@0 mut (u32), u32))
+
+- original context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
+  }
+  None -> &mut@4 (2: u32) ;
+}
+
+
+- new context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> &mut@5 (s@1 : (&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    ⌊mut@5, proj_loans (s@1 : (&r@0 mut (u32), u32))⌋
+  }
+  None -> &mut@4 (2: u32) ;
+}
+
+
+[Debug] expand_symbolic_value: s@1 : (&r@0 mut (u32), u32)
+
+- original context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> &mut@5 (s@1 : (&r@0 mut (u32), u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    ⌊mut@5, proj_loans (s@1 : (&r@0 mut (u32), u32))⌋
+  }
+  None -> &mut@4 (2: u32) ;
+}
+
+
+- new context:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> &mut@5 ((s@2 : &r@0 mut (u32), s@3 : u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
+  }
+  None -> &mut@4 (2: u32) ;
+}
+
 
-[Debug] expand_bottom_value_from_projection:
-pe: (Expressions.Field ((Expressions.ProjAdt (1, (Some 0))), 0))
-ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).1 := move var@2;
-  set_discriminant(l, 0);
-  var@7 := move l;
-  var@6 := move split_list<i32>(move var@7);
-  hd := copy (var@6).0;
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
+  *((pp1).1) := 3: u32;
   return
 ]
 
@@ -129339,23 +128177,27 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> &mut@5 ((&mut@4 (2: u32), s@3 : u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
+  }
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  (l as test1::List::Cons).1 := move var@2
+  *((pp1).1) := 3: u32
 ]
 
 **Context**:
@@ -129365,16 +128207,20 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> &mut@5 ((&mut@4 (2: u32), s@3 : u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
+  }
 }
 
 
@@ -129387,34 +128233,28 @@ ty: (Types.Adt ((Types.AdtId 1), [], [(Types.Integer Types.I32)]))
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = ⊥ : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> s@0 : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> &mut@5 ((&mut@4 (2: u32), s@3 : u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
+  }
 }
 
 
 - op:
-move var@2
+3: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(l, 0);
-  var@7 := move l;
-  var@6 := move split_list<i32>(move var@7);
-  hd := copy (var@6).0;
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
   return
 ]
 
@@ -129425,23 +128265,30 @@ move var@2
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⌊mut@0⌋ ;
+  Some (px) -> ⊥ : &'_ mut (u32) ;
+  Some (p) -> ⌊mut@1⌋ ;
+  Some (var@4) -> ⊥ : &'_ mut (u32) ;
+  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
+  Some (pp1) -> &mut@5 ((&mut@4 (2: u32), 3: u32)) ;
+  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
+  Some (y) -> ⌊mut@3⌋ ;
+  Some (var@9) -> ⊥ : &'_ mut (u32) ;
+  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
+  abs@0{parents={}}{regions={0}} {
+    &mut@2 ((&mut@0 (0: u32), 1: u32)),
+    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
+  }
 }
 
 
 
+[Debug] test_function_symbolic: id_mut_mut_pair
 [Debug] 
 **About to evaluate statement**: [
-  set_discriminant(l, 0)
+  var@2 := &mut *(x);
+  var@0 := &mut *(var@2);
+  return
 ]
 
 **Context**:
@@ -129450,33 +128297,19 @@ move var@2
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
+  Some (x) -> s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := move l;
-  var@6 := move split_list<i32>(move var@7);
-  hd := copy (var@6).0;
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
-  return
+  var@2 := &mut *(x)
 ]
 
 **Context**:
@@ -129485,81 +128318,51 @@ move var@2
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
+  Some (x) -> s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := move l
-]
+[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32)))
 
-**Context**:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
+  Some (x) -> s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
 }
 
 
-
-[Debug] eval_operand:
-- ctx:
+- new context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@0 mut ((&r@0 mut (T), u32)))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
+  Some (x) -> &mut@0 (s@1 : &r@0 mut ((&r@0 mut (T), u32))) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
 }
 
 
-- op:
-move l
-
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := move split_list<i32>(move var@7);
-  hd := copy (var@6).0;
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
+  var@0 := &mut *(var@2);
   return
 ]
 
@@ -129569,24 +128372,19 @@ move l
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@0 mut ((&r@0 mut (T), u32)))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (s@1 : &r@0 mut ((&r@0 mut (T), u32))) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := move split_list<i32>(move var@7)
+  var@0 := &mut *(var@2)
 ]
 
 **Context**:
@@ -129595,54 +128393,42 @@ move l
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@0 mut ((&r@0 mut (T), u32)))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (s@1 : &r@0 mut ((&r@0 mut (T), u32))) ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> ⊥ : (i32, test1::List<i32>) ;
-  Some (var@7) -> test1::List::Cons { 0 = 0: i32; 1 = s@0 : std::boxed::Box<test1::List<i32>>; } ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@0 mut ((&r@0 mut (T), u32)))⌋
+  }
+  Some (var@0) -> &mut@2 (s@1 : &r@0 mut ((&r@0 mut (T), u32))) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (⌊mut@2⌋) ;
 }
 
 
-- op:
-move var@7
 
+[Debug] test_function_symbolic: id_mut_mut_mut_same
 [Debug] 
 **About to evaluate statement**: [
-  hd := copy (var@6).0;
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
+  var@2 := &mut *(x);
+  var@0 := &mut *(var@2);
   return
 ]
 
@@ -129652,24 +128438,19 @@ move var@7
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> s@1 : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
+  Some (x) -> s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  hd := copy (var@6).0
+  var@2 := &mut *(x)
 ]
 
 **Context**:
@@ -129678,96 +128459,73 @@ move var@7
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> s@1 : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
+  Some (x) -> s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32)))
+
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> s@1 : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))))
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
+  Some (x) -> s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
 }
 
 
-- op:
-copy (var@6).0
-
-[Debug] expand_symbolic_value: s@1 : (i32, test1::List<i32>)
-
-- original context:
+- new context:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> s@1 : (i32, test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@0 mut (&r@0 mut (u32)))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
+  Some (x) -> &mut@0 (s@1 : &r@0 mut (&r@0 mut (u32))) ;
+  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
 }
 
 
-- new context:
+[Debug] 
+**About to evaluate statement**: [
+  var@0 := &mut *(var@2);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> ⊥ : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, s@3 : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@0 mut (&r@0 mut (u32)))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (s@1 : &r@0 mut (&r@0 mut (u32))) ;
 }
 
 
+
 [Debug] 
 **About to evaluate statement**: [
-  tl := move (var@6).1;
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
-  return
+  var@0 := &mut *(var@2)
 ]
 
 **Context**:
@@ -129776,24 +128534,19 @@ copy (var@6).0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, s@3 : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@0 mut (&r@0 mut (u32)))⌋
+  }
+  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (s@1 : &r@0 mut (&r@0 mut (u32))) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  tl := move (var@6).1
+  return
 ]
 
 **Context**:
@@ -129802,52 +128555,47 @@ copy (var@6).0
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, s@3 : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  abs@0{parents={}}{regions={0}} {
+    ⌊mut@0, proj_loans (s@1 : &r@0 mut (&r@0 mut (u32)))⌋
+  }
+  Some (var@0) -> &mut@2 (s@1 : &r@0 mut (&r@0 mut (u32))) ;
+  Some (x) -> &mut@0 (⌊mut@1⌋) ;
+  Some (var@2) -> &mut@1 (⌊mut@2⌋) ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] test_function_symbolic: id_borrow1
+[Debug] 
+**About to evaluate statement**: [
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
+  abs@0{parents={}}{regions={0}} {
+    proj_loans (s@0 : &r@0 mut (&r@1 (u32))),
+    proj_loans (s@1 : &r@0 (&r@0 mut (u32)))
+  }
+  abs@1{parents={0}}{regions={1}} {
+    proj_loans (s@0 : &r@0 mut (&r@1 (u32))),
+    proj_loans (s@1 : &r@0 (&r@0 mut (u32)))
+  }
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, s@3 : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (_x) -> s@0 : &r@0 mut (&r@1 (u32)) ;
+  Some (_y) -> s@1 : &r@0 (&r@0 mut (u32)) ;
 }
 
 
-- op:
-move (var@6).1
 
+[Debug] test_function_symbolic: test_static
 [Debug] 
 **About to evaluate statement**: [
-  var@10 := copy hd;
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
+  var@0 := copy x;
   return
 ]
 
@@ -129857,24 +128605,15 @@ move (var@6).1
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : &'_ (u32) ;
+  Some (x) -> s@0 : &'static (u32) ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@10 := copy hd
+  var@0 := copy x
 ]
 
 **Context**:
@@ -129883,17 +128622,8 @@ move (var@6).1
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : &'_ (u32) ;
+  Some (x) -> s@0 : &'static (u32) ;
 }
 
 
@@ -129905,29 +128635,16 @@ move (var@6).1
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : &'_ (u32) ;
+  Some (x) -> s@0 : &'static (u32) ;
 }
 
 
 - op:
-copy hd
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := move var@10 == 0: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
   return
 ]
 
@@ -129937,24 +128654,17 @@ copy hd
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@2 : i32 ;
+  Some (var@0) -> s@0 : &'static (u32) ;
+  Some (x) -> s@0 : &'static (u32) ;
 }
 
 
 
+[Debug] test_function_symbolic: test_char
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := move var@10 == 0: i32
+  var@0 := a;
+  return
 ]
 
 **Context**:
@@ -129963,44 +128673,26 @@ copy hd
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@2 : i32 ;
+  Some (var@0) -> ⊥ : char ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  var@0 := a
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@2 : i32 ;
+  Some (var@0) -> ⊥ : char ;
 }
 
 
-- op:
-move var@10
 
 [Debug] eval_operand:
 - ctx:
@@ -130009,28 +128701,62 @@ move var@10
 
 # Frame 0:
 {
-  Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (var@0) -> ⊥ : char ;
 }
 
 
 - op:
-0: i32
+a
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  drop(tl);
+  return
+]
+
+**Context**:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> a ;
+}
+
+
+
+[Debug] test_function_symbolic: test_loops
+[Debug] 
+**About to evaluate statement**: [
+  x := move test_loop1(2: u32);
+  var@4 := copy x;
+  var@3 := move var@4 == 2: u32;
+  var@2 := ¬ move var@3;
+  assert(¬move var@2);
+  x := move test_loop2(2: u32);
+  var@8 := copy x;
+  var@7 := move var@8 == 1: u32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -130041,23 +128767,37 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@4 : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := ¬ move var@9
+  x := move test_loop1(2: u32)
 ]
 
 **Context**:
@@ -130067,16 +128807,30 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@4 : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -130089,26 +128843,67 @@ move var@10
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@4 : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@9
+2: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@8);
-  drop(tl);
+  var@4 := copy x;
+  var@3 := move var@4 == 2: u32;
+  var@2 := ¬ move var@3;
+  assert(¬move var@2);
+  x := move test_loop2(2: u32);
+  var@8 := copy x;
+  var@7 := move var@8 == 1: u32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -130119,23 +128914,37 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> s@5 : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@8)
+  var@4 := copy x
 ]
 
 **Context**:
@@ -130145,16 +128954,30 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> s@5 : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -130167,25 +128990,66 @@ move var@9
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> true ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@8
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  drop(tl);
+  var@3 := move var@4 == 2: u32;
+  var@2 := ¬ move var@3;
+  assert(¬move var@2);
+  x := move test_loop2(2: u32);
+  var@8 := copy x;
+  var@7 := move var@8 == 1: u32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -130196,23 +129060,37 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  drop(tl)
+  var@3 := move var@4 == 2: u32
 ]
 
 **Context**:
@@ -130222,57 +129100,139 @@ move var@8
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> s@3 : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] drop_value: place: tl
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
 
-**Context**:
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> s@0 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
+}
+
+
+- op:
+move var@4
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (l) -> ⊥ : test1::List<i32> ;
-  Some (var@2) -> ⊥ : std::boxed::Box<test1::List<i32>> ;
-  Some (var@3) -> ⊥ : test1::List<i32> ;
-  Some (hd) -> s@2 : i32 ;
-  Some (tl) -> ⊥ : test1::List<i32> ;
-  Some (var@6) -> (s@2 : i32, ⊥ : test1::List<i32>) ;
-  Some (var@7) -> ⊥ : test1::List<i32> ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
+- op:
+2: u32
 
-[Debug] test_function_symbolic: get_elem
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy b;
-  if (move var@4) {
-    var@0 := &mut *(x)
-  }
-  else {
-    var@0 := move y
-  };
+  var@2 := ¬ move var@3;
+  assert(¬move var@2);
+  x := move test_loop2(2: u32);
+  var@8 := copy x;
+  var@7 := move var@8 == 1: u32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -130282,23 +129242,38 @@ move var@8
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : bool),
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> s@0 : bool ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> s@1 : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := copy b
+  var@2 := ¬ move var@3
 ]
 
 **Context**:
@@ -130307,16 +129282,31 @@ move var@8
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : bool),
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> s@0 : bool ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> s@1 : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -130328,30 +129318,65 @@ move var@8
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : bool),
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> s@0 : bool ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> s@1 : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-copy b
+move var@3
 
 [Debug] 
 **About to evaluate statement**: [
-  if (move var@4) {
-    var@0 := &mut *(x)
-  }
-  else {
-    var@0 := move y
-  };
+  assert(¬move var@2);
+  x := move test_loop2(2: u32);
+  var@8 := copy x;
+  var@7 := move var@8 == 1: u32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -130361,28 +129386,38 @@ copy b
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : bool),
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> s@0 : bool ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> s@0 : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> s@2 : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  if (move var@4) {
-    var@0 := &mut *(x)
-  }
-  else {
-    var@0 := move y
-  }
+  assert(¬move var@2)
 ]
 
 **Context**:
@@ -130391,16 +129426,31 @@ copy b
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : bool),
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> s@0 : bool ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> s@0 : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> s@2 : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -130412,25 +129462,65 @@ copy b
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    true,
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> true ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> true ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> true ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@4
+move var@2
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := &mut *(x)
+  x := move test_loop2(2: u32);
+  var@8 := copy x;
+  var@7 := move var@8 == 1: u32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
+  return
 ]
 
 **Context**:
@@ -130439,59 +129529,74 @@ move var@4
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    true,
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> true ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] expand_symbolic_value: s@1 : &r@0 mut (T)
+[Debug] 
+**About to evaluate statement**: [
+  x := move test_loop2(2: u32)
+]
 
-- original context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    true,
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> true ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    true,
-    ⌊mut@0, proj_loans (s@3 : T)⌋,
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> true ;
-  Some (x) -> &mut@0 (s@3 : T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
-}
-
 
 [Debug] eval_operand:
 - ctx:
@@ -130500,25 +129605,64 @@ move var@4
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    false,
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> false ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> false ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@4
+2: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@0 := move y
+  var@8 := copy x;
+  var@7 := move var@8 == 1: u32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
+  return
 ]
 
 **Context**:
@@ -130527,46 +129671,38 @@ move var@4
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    false,
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> false ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    false,
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (T) ;
-  Some (b) -> false ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
-- op:
-move y
 
 [Debug] 
 **About to evaluate statement**: [
-  return
+  var@8 := copy x
 ]
 
 **Context**:
@@ -130575,69 +129711,98 @@ move y
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    true,
-    ⌊mut@0, proj_loans (s@3 : T)⌋,
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> &mut@1 (s@3 : T) ;
-  Some (b) -> true ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (y) -> s@2 : &r@0 mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
-  abs@0{parents={}}{regions={0}} {
-    false,
-    proj_loans (s@1 : &r@0 mut (T)),
-    proj_loans (s@2 : &r@0 mut (T))
-  }
-  Some (var@0) -> s@2 : &r@0 mut (T) ;
-  Some (b) -> false ;
-  Some (x) -> s@1 : &r@0 mut (T) ;
-  Some (y) -> ⊥ : &'_ mut (T) ;
-  Some (var@4) -> ⊥ : bool ;
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
+- op:
+copy x
 
-[Debug] test_function_symbolic: get_elem_test
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32;
-  y := 0: i32;
-  var@5 := &mut x;
-  var@4 := &two-phase *(var@5);
-  var@7 := &mut y;
-  var@6 := &two-phase *(var@7);
-  z := move get_elem<i32>(true, move var@4, move var@6);
-  var@8 := copy *(z);
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
+  var@7 := move var@8 == 1: u32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
   var@10 := ¬ move var@11;
   assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -130648,31 +129813,37 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@3 : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32
+  var@7 := move var@8 == 1: u32
 ]
 
 **Context**:
@@ -130682,24 +129853,30 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@3 : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -130712,52 +129889,98 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@3 : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-0: i32
+move var@8
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
+}
+
+
+- op:
+1: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  y := 0: i32;
-  var@5 := &mut x;
-  var@4 := &two-phase *(var@5);
-  var@7 := &mut y;
-  var@6 := &two-phase *(var@7);
-  z := move get_elem<i32>(true, move var@4, move var@6);
-  var@8 := copy *(z);
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
   var@10 := ¬ move var@11;
   assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -130768,31 +129991,37 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@4 : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  y := 0: i32
+  var@6 := ¬ move var@7
 ]
 
 **Context**:
@@ -130802,24 +130031,30 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@4 : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -130832,51 +130067,59 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> ⊥ : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@4 : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-0: i32
+move var@7
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := &mut x;
-  var@4 := &two-phase *(var@5);
-  var@7 := &mut y;
-  var@6 := &two-phase *(var@7);
-  z := move get_elem<i32>(true, move var@4, move var@6);
-  var@8 := copy *(z);
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
+  assert(¬move var@6);
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
   var@10 := ¬ move var@11;
   assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -130887,31 +130130,37 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 0: i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> s@5 : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := &mut x
+  assert(¬move var@6)
 ]
 
 **Context**:
@@ -130921,83 +130170,95 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (y) -> 0: i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> s@5 : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := &two-phase *(var@5);
-  var@7 := &mut y;
-  var@6 := &two-phase *(var@7);
-  z := move get_elem<i32>(true, move var@4, move var@6);
-  var@8 := copy *(z);
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> 0: i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (0: i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> true ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
+- op:
+move var@6
 
 [Debug] 
 **About to evaluate statement**: [
-  var@4 := &two-phase *(var@5)
+  x := move test_loop3(2: u32);
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
+  return
 ]
 
 **Context**:
@@ -131007,48 +130268,37 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> 0: i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (0: i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := &mut y;
-  var@6 := &two-phase *(var@7);
-  z := move get_elem<i32>(true, move var@4, move var@6);
-  var@8 := copy *(z);
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
+  x := move test_loop3(2: u32)
 ]
 
 **Context**:
@@ -131058,80 +130308,93 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> 0: i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
-  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := &mut y
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> 0: i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
-  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
+- op:
+2: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := &two-phase *(var@7);
-  z := move get_elem<i32>(true, move var@4, move var@6);
-  var@8 := copy *(z);
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
+  var@12 := copy x;
+  var@11 := move var@12 == 3: u32;
   var@10 := ¬ move var@11;
   assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -131142,31 +130405,37 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
-  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (0: i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@6 := &two-phase *(var@7)
+  var@12 := copy x
 ]
 
 **Context**:
@@ -131176,45 +130445,92 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
-  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (0: i32) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
+}
+
+
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
+# 1 frame(s)
+
+# Frame 0:
+{
+  Some (var@0) -> ⊥ : () ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
+- op:
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  z := move get_elem<i32>(true, move var@4, move var@6);
-  var@8 := copy *(z);
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
+  var@11 := move var@12 == 3: u32;
   var@10 := ¬ move var@11;
   assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -131225,31 +130541,37 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
-  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
-  Some (var@6) -> ⌊inactivated_mut@3⌋ ;
-  Some (var@7) -> &mut@2 (@shared_loan({3}, 0: i32)) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> s@6 : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  z := move get_elem<i32>(true, move var@4, move var@6)
+  var@11 := move var@12 == 3: u32
 ]
 
 **Context**:
@@ -131259,716 +130581,30 @@ move y
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⌊inactivated_mut@1⌋ ;
-  Some (var@5) -> &mut@0 (@shared_loan({1}, 0: i32)) ;
-  Some (var@6) -> ⌊inactivated_mut@3⌋ ;
-  Some (var@7) -> &mut@2 (@shared_loan({3}, 0: i32)) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] activate_inactivated_mut_borrow: resulting value:
-0: i32
-[Debug] activate_inactivated_mut_borrow: resulting value:
-0: i32
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> &mut@1 (0: i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> &mut@3 (0: i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-true
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> &mut@1 (0: i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> &mut@3 (0: i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@4
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> &mut@3 (0: i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@6
-
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := copy *(z);
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> s@0 : &r@0 mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    proj_loans (s@0 : &r@0 mut (i32))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := copy *(z)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> s@0 : &r@0 mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    proj_loans (s@0 : &r@0 mut (i32))
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> s@0 : &r@0 mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    proj_loans (s@0 : &r@0 mut (i32))
-  }
-}
-
-
-- op:
-copy *(z)
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut (i32)
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> s@0 : &r@0 mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    proj_loans (s@0 : &r@0 mut (i32))
-  }
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@1 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *(z) := copy var@8 + 1: i32;
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@1 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *(z) := copy var@8 + 1: i32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@1 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@1 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-- op:
-copy var@8
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@1 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-- op:
-1: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@12 := copy *(z);
-  var@11 := move var@12 == 1: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@12 := copy *(z)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-- op:
-copy *(z)
-
-[Debug] 
-**About to evaluate statement**: [
-  var@11 := move var@12 == 1: i32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@2 : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@11 := move var@12 == 1: i32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@2 : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> s@6 : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -131981,30 +130617,30 @@ copy *(z)
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@2 : i32 ;
-  Some (var@13) -> ⊥ : bool ;
+  Some (var@12) -> s@6 : u32 ;
+  Some (x) -> ⊥ : u32 ;
   Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -132019,14195 +130655,1673 @@ move var@12
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-- op:
-1: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@3 : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := ¬ move var@11
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@3 : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@3 : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-- op:
-move var@11
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@10);
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> s@4 : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@10)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> s@4 : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> true ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-- op:
-move var@10
-
-[Debug] 
-**About to evaluate statement**: [
-  var@15 := copy x;
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@15 := copy x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-- op:
-copy x
-
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-[Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 1))
-[Debug] end borrow: 1:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
-[Debug] end_abstraction: 0
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-[Debug] end_abstraction: 0
-- context after parent abstractions ended:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-[Debug] end borrow: 4:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-[Debug] give_back:
-- bid: 4
-- content: &mut@4 (s@2 : i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-[Debug] give_back_value:
-- bid: 4
-- value: s@2 : i32
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-[Debug] end_abstraction: 0
-- context after loans ended:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    @ended_mut_loan{ given_back=proj_borrows (s@2 : i32 <: i32); child=proj_loans (s@1 : i32) }
-  }
-}
-
-[Debug] give_back_value:
-- bid: 1
-- value: s@5 : i32
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    ⊥ : &r@0 mut (i32),
-    &mut@3 (0: i32),
-    @ended_mut_loan{ given_back=proj_borrows (s@2 : i32 <: i32); child=proj_loans (s@1 : i32) }
-  }
-}
-
-
-[Debug] give_back_value:
-- bid: 3
-- value: s@6 : i32
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (s@5 : i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    ⊥ : &r@0 mut (i32),
-    ⊥ : &r@0 mut (i32),
-    @ended_mut_loan{ given_back=proj_borrows (s@2 : i32 <: i32); child=proj_loans (s@1 : i32) }
-  }
-}
-
-
-[Debug] end_abstraction: 0
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> &mut@4 (s@2 : i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (⌊mut@3⌋) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    true,
-    &mut@1 (0: i32),
-    &mut@3 (0: i32),
-    ⌊mut@4, proj_loans (s@1 : i32)⌋
-  }
-}
-
-
-- new context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (s@5 : i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> &mut@0 (s@5 : i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-[Debug] give_back:
-- bid: 0
-- content: &mut@0 (s@5 : i32)
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-[Debug] give_back_value:
-- bid: 0
-- value: s@5 : i32
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@14 := move var@15 == 1: i32;
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> s@5 : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@14 := move var@15 == 1: i32
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> s@5 : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> s@5 : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@15
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-1: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@13 := ¬ move var@14;
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@7 : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@13 := ¬ move var@14
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@7 : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@7 : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@14
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@13);
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> s@8 : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@13)
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> s@8 : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> true ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@13
-
-[Debug] 
-**About to evaluate statement**: [
-  var@18 := copy y;
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@18 := copy y
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-copy y
-
-[Debug] end borrow: 2:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> &mut@2 (s@6 : i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-[Debug] give_back:
-- bid: 2
-- content: &mut@2 (s@6 : i32)
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-[Debug] give_back_value:
-- bid: 2
-- value: s@6 : i32
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> ⌊mut@2⌋ ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@17 := move var@18 == 0: i32;
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> s@6 : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@17 := move var@18 == 0: i32
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> s@6 : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> s@6 : i32 ;
-}
-
-
-- op:
-move var@18
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-0: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@16 := ¬ move var@17;
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@9 : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@16 := ¬ move var@17
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@9 : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@9 : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@17
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@16);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> s@10 : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@16)
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> s@10 : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> true ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@16
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@5 : i32 ;
-  Some (y) -> s@6 : i32 ;
-  Some (z) -> ⊥ : &'_ mut (i32) ;
-  Some (var@4) -> ⊥ : &'_ mut (i32) ;
-  Some (var@5) -> ⊥ : &'_ mut (i32) ;
-  Some (var@6) -> ⊥ : &'_ mut (i32) ;
-  Some (var@7) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> s@1 : i32 ;
-  Some (var@9) -> ⊥ : (i32, bool) ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : i32 ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : i32 ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : bool ;
-  Some (var@18) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] test_function_symbolic: id_mut_mut
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := &mut *(x);
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-  Some (x) -> s@0 : &r@0 mut (&r@1 mut (T)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := &mut *(x)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-  Some (x) -> s@0 : &r@0 mut (&r@1 mut (T)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-}
-
-
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@1 mut (T))
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (T)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-  Some (x) -> s@0 : &r@0 mut (&r@1 mut (T)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@1 mut (T))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_loan(0, proj_loans (s@1 : &r@1 mut (T)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-  Some (x) -> &mut@0 (s@1 : &r@1 mut (T)) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@1 mut (T))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_loan(0, proj_loans (s@1 : &r@1 mut (T)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (s@1 : &r@1 mut (T)) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@1 mut (T))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_loan(0, proj_loans (s@1 : &r@1 mut (T)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (T)) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (s@1 : &r@1 mut (T)) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@1 mut (T))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_loan(0, proj_loans (s@1 : &r@1 mut (T)))
-  }
-  Some (var@0) -> &mut@2 (s@1 : &r@1 mut (T)) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (⌊mut@2⌋) ;
-}
-
-
-
-[Debug] test_function_symbolic: id_mut_pair
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := &mut *(x);
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (T), u32)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-  Some (x) -> s@0 : &r@0 mut ((&r@0 mut (T), u32)) ;
-  Some (var@2) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := &mut *(x)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (T), u32)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-  Some (x) -> s@0 : &r@0 mut ((&r@0 mut (T), u32)) ;
-  Some (var@2) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-}
-
-
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut ((&r@0 mut (T), u32))
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (T), u32)))
-  }
-  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-  Some (x) -> s@0 : &r@0 mut ((&r@0 mut (T), u32)) ;
-  Some (var@2) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : (&r@0 mut (T), u32))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-  Some (x) -> &mut@0 (s@1 : (&r@0 mut (T), u32)) ;
-  Some (var@2) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : (&r@0 mut (T), u32))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (s@1 : (&r@0 mut (T), u32)) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : (&r@0 mut (T), u32))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut ((&'_ mut (T), u32)) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (s@1 : (&r@0 mut (T), u32)) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : (&r@0 mut (T), u32))⌋
-  }
-  Some (var@0) -> &mut@2 (s@1 : (&r@0 mut (T), u32)) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (⌊mut@2⌋) ;
-}
-
-
-
-[Debug] test_function_symbolic: id_mut_pair_test1
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: u32;
-  px := &mut x;
-  var@4 := move px;
-  (p).0 := move var@4;
-  (p).1 := 1: u32;
-  pp0 := &mut p;
-  var@7 := &two-phase *(pp0);
-  pp1 := move id_mut_pair<u32>(move var@7);
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-- op:
-0: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x;
-  var@4 := move px;
-  (p).0 := move var@4;
-  (p).1 := 1: u32;
-  pp0 := &mut p;
-  var@7 := &two-phase *(pp0);
-  pp1 := move id_mut_pair<u32>(move var@7);
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: u32 ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: u32 ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := move px;
-  (p).0 := move var@4;
-  (p).1 := 1: u32;
-  pp0 := &mut p;
-  var@7 := &two-phase *(pp0);
-  pp1 := move id_mut_pair<u32>(move var@7);
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := move px
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-- op:
-move px
-
-[Debug] 
-**About to evaluate statement**: [
-  (p).0 := move var@4;
-  (p).1 := 1: u32;
-  pp0 := &mut p;
-  var@7 := &two-phase *(pp0);
-  pp1 := move id_mut_pair<u32>(move var@7);
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> &mut@0 (0: u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  (p).0 := move var@4
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> &mut@0 (0: u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⊥ : (&'_ mut (u32), u32) ;
-  Some (var@4) -> &mut@0 (0: u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-- op:
-move var@4
-
-[Debug] expand_bottom_value_from_projection:
-pe: (Expressions.Field ((Expressions.ProjTuple 2), 0))
-ty: (Types.Adt (Types.Tuple, [],
-   [(Types.Ref (Types.Erased, (Types.Integer Types.U32), Types.Mut));
-     (Types.Integer Types.U32)]
-   ))
-[Debug] 
-**About to evaluate statement**: [
-  (p).1 := 1: u32;
-  pp0 := &mut p;
-  var@7 := &two-phase *(pp0);
-  pp1 := move id_mut_pair<u32>(move var@7);
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> (&mut@0 (0: u32), ⊥ : u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  (p).1 := 1: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> (&mut@0 (0: u32), ⊥ : u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> (&mut@0 (0: u32), ⊥ : u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-- op:
-1: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  pp0 := &mut p;
-  var@7 := &two-phase *(pp0);
-  pp1 := move id_mut_pair<u32>(move var@7);
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> (&mut@0 (0: u32), 1: u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  pp0 := &mut p
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> (&mut@0 (0: u32), 1: u32) ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := &two-phase *(pp0);
-  pp1 := move id_mut_pair<u32>(move var@7);
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 ((&mut@0 (0: u32), 1: u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := &two-phase *(pp0)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 ((&mut@0 (0: u32), 1: u32)) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  pp1 := move id_mut_pair<u32>(move var@7);
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (@shared_loan({2}, (&mut@0 (0: u32), 1: u32))) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⌊inactivated_mut@2⌋ ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  pp1 := move id_mut_pair<u32>(move var@7)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (@shared_loan({2}, (&mut@0 (0: u32), 1: u32))) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> ⌊inactivated_mut@2⌋ ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-
-[Debug] activate_inactivated_mut_borrow: resulting value:
-(&mut@0 (0: u32), 1: u32)
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (var@7) -> &mut@2 ((&mut@0 (0: u32), 1: u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-}
-
-
-- op:
-move var@7
-
-[Debug] 
-**About to evaluate statement**: [
-  y := 2: u32;
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  y := 2: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⊥ : u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := &mut y;
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> 2: u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := &mut y
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> 2: u32 ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> ⊥ : &'_ mut (u32) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@9 := &mut *(var@10);
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (2: u32) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@9 := &mut *(var@10)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (2: u32) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *((pp1).0) := move var@9;
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> &mut@4 (2: u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *((pp1).0) := move var@9
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> &mut@4 (2: u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> &mut@4 (2: u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-}
-
-
-- op:
-move var@9
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut ((&r@0 mut (u32), u32))
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> s@0 : &r@0 mut ((&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    proj_loans (s@0 : &r@0 mut ((&r@0 mut (u32), u32)))
-  }
-  None -> &mut@4 (2: u32) ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> &mut@5 (s@1 : (&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    ⌊mut@5, proj_loans (s@1 : (&r@0 mut (u32), u32))⌋
-  }
-  None -> &mut@4 (2: u32) ;
-}
-
-
-[Debug] expand_symbolic_value: s@1 : (&r@0 mut (u32), u32)
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> &mut@5 (s@1 : (&r@0 mut (u32), u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    ⌊mut@5, proj_loans (s@1 : (&r@0 mut (u32), u32))⌋
-  }
-  None -> &mut@4 (2: u32) ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> &mut@5 ((s@2 : &r@0 mut (u32), s@3 : u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
-  }
-  None -> &mut@4 (2: u32) ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *((pp1).1) := 3: u32;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> &mut@5 ((&mut@4 (2: u32), s@3 : u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *((pp1).1) := 3: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> &mut@5 ((&mut@4 (2: u32), s@3 : u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> &mut@5 ((&mut@4 (2: u32), s@3 : u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
-  }
-}
-
-
-- op:
-3: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (u32) ;
-  Some (p) -> ⌊mut@1⌋ ;
-  Some (var@4) -> ⊥ : &'_ mut (u32) ;
-  Some (pp0) -> &mut@1 (⌊mut@2⌋) ;
-  Some (pp1) -> &mut@5 ((&mut@4 (2: u32), 3: u32)) ;
-  Some (var@7) -> ⊥ : &'_ mut ((&'_ mut (u32), u32)) ;
-  Some (y) -> ⌊mut@3⌋ ;
-  Some (var@9) -> ⊥ : &'_ mut (u32) ;
-  Some (var@10) -> &mut@3 (⌊mut@4⌋) ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 ((&mut@0 (0: u32), 1: u32)),
-    ⌊mut@5, (proj_loans (s@2 : &r@0 mut (u32)), proj_loans (s@3 : u32))⌋
-  }
-}
-
-
-
-[Debug] test_function_symbolic: id_mut_mut_pair
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := &mut *(x);
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-  Some (x) -> s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := &mut *(x)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-  Some (x) -> s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-}
-
-
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32)))
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-  Some (x) -> s@0 : &r@0 mut (&r@0 mut ((&r@0 mut (T), u32))) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@0 mut ((&r@0 mut (T), u32)))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-  Some (x) -> &mut@0 (s@1 : &r@0 mut ((&r@0 mut (T), u32))) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@0 mut ((&r@0 mut (T), u32)))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (s@1 : &r@0 mut ((&r@0 mut (T), u32))) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@0 mut ((&r@0 mut (T), u32)))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut ((&'_ mut (T), u32))) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (s@1 : &r@0 mut ((&r@0 mut (T), u32))) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@0 mut ((&r@0 mut (T), u32)))⌋
-  }
-  Some (var@0) -> &mut@2 (s@1 : &r@0 mut ((&r@0 mut (T), u32))) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (⌊mut@2⌋) ;
-}
-
-
-
-[Debug] test_function_symbolic: id_mut_mut_mut_same
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := &mut *(x);
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-  Some (x) -> s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := &mut *(x)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-  Some (x) -> s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-}
-
-
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32)))
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))))
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-  Some (x) -> s@0 : &r@0 mut (&r@0 mut (&r@0 mut (u32))) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@0 mut (&r@0 mut (u32)))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-  Some (x) -> &mut@0 (s@1 : &r@0 mut (&r@0 mut (u32))) ;
-  Some (var@2) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@0 mut (&r@0 mut (u32)))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (s@1 : &r@0 mut (&r@0 mut (u32))) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := &mut *(var@2)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@0 mut (&r@0 mut (u32)))⌋
-  }
-  Some (var@0) -> ⊥ : &'_ mut (&'_ mut (&'_ mut (u32))) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (s@1 : &r@0 mut (&r@0 mut (u32))) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    ⌊mut@0, proj_loans (s@1 : &r@0 mut (&r@0 mut (u32)))⌋
-  }
-  Some (var@0) -> &mut@2 (s@1 : &r@0 mut (&r@0 mut (u32))) ;
-  Some (x) -> &mut@0 (⌊mut@1⌋) ;
-  Some (var@2) -> &mut@1 (⌊mut@2⌋) ;
-}
-
-
-
-[Debug] test_function_symbolic: id_borrow1
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  abs@0{parents={}}{regions={0}} {
-    proj_loans (s@0 : &r@0 mut (&r@1 (u32))),
-    proj_loans (s@1 : &r@0 (&r@0 mut (u32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    proj_loans (s@0 : &r@0 mut (&r@1 (u32))),
-    proj_loans (s@1 : &r@0 (&r@0 mut (u32)))
-  }
-  Some (var@0) -> ⊥ : () ;
-  Some (_x) -> s@0 : &r@0 mut (&r@1 (u32)) ;
-  Some (_y) -> s@1 : &r@0 (&r@0 mut (u32)) ;
-}
-
-
-
-[Debug] test_function_symbolic: test_static
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := copy x;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : &'_ (u32) ;
-  Some (x) -> s@0 : &'static (u32) ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := copy x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : &'_ (u32) ;
-  Some (x) -> s@0 : &'static (u32) ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : &'_ (u32) ;
-  Some (x) -> s@0 : &'static (u32) ;
-}
-
-
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> s@0 : &'static (u32) ;
-  Some (x) -> s@0 : &'static (u32) ;
-}
-
-
-
-[Debug] test_function_symbolic: test_char
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := a;
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : char ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@0 := a
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : char ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : char ;
-}
-
-
-- op:
-a
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> a ;
-}
-
-
-
-[Debug] test_function_symbolic: test_loops
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop1(2: u32);
-  var@4 := copy x;
-  var@3 := move var@4 == 2: u32;
-  var@2 := ¬ move var@3;
-  assert(¬move var@2);
-  x := move test_loop2(2: u32);
-  var@8 := copy x;
-  var@7 := move var@8 == 1: u32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop1(2: u32)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := copy x;
-  var@3 := move var@4 == 2: u32;
-  var@2 := ¬ move var@3;
-  assert(¬move var@2);
-  x := move test_loop2(2: u32);
-  var@8 := copy x;
-  var@7 := move var@8 == 1: u32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@4 := copy x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@3 := move var@4 == 2: u32;
-  var@2 := ¬ move var@3;
-  assert(¬move var@2);
-  x := move test_loop2(2: u32);
-  var@8 := copy x;
-  var@7 := move var@8 == 1: u32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@3 := move var@4 == 2: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> s@0 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@4
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := ¬ move var@3;
-  assert(¬move var@2);
-  x := move test_loop2(2: u32);
-  var@8 := copy x;
-  var@7 := move var@8 == 1: u32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> s@1 : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@2 := ¬ move var@3
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> s@1 : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> s@1 : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@3
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@2);
-  x := move test_loop2(2: u32);
-  var@8 := copy x;
-  var@7 := move var@8 == 1: u32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> s@2 : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@2)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> s@2 : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> true ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@2
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop2(2: u32);
-  var@8 := copy x;
-  var@7 := move var@8 == 1: u32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop2(2: u32)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := copy x;
-  var@7 := move var@8 == 1: u32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := copy x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := move var@8 == 1: u32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@3 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := move var@8 == 1: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@3 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@3 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@8
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-1: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@4 : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@6 := ¬ move var@7
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@4 : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@4 : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@7
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@6);
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> s@5 : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@6)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> s@5 : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> true ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@6
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop3(2: u32);
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop3(2: u32)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@12 := copy x;
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@12 := copy x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@11 := move var@12 == 3: u32;
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@6 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@11 := move var@12 == 3: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@6 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@6 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@12
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-3: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := ¬ move var@11;
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@7 : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := ¬ move var@11
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@7 : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@7 : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@11
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@10);
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> s@8 : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@10)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> s@8 : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> true ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@10
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop4(20: u32);
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop4(20: u32)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-20: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@16 := copy x;
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@16 := copy x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@15 := move var@16 == 1: u32;
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> s@9 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@15 := move var@16 == 1: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> s@9 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> s@9 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@16
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-1: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@14 := ¬ move var@15;
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> s@10 : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@14 := ¬ move var@15
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> s@10 : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> s@10 : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@15
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@14);
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> s@11 : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@14)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> s@11 : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> true ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@14
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop5(2: u32);
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop5(2: u32)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@20 := copy x;
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@20 := copy x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@19 := move var@20 == 2: u32;
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> s@12 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@19 := move var@20 == 2: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> s@12 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> s@12 : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@20
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@18 := ¬ move var@19;
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> s@13 : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@18 := ¬ move var@19
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> s@13 : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> s@13 : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@19
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@18);
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> s@14 : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@18)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> s@14 : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> true ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@18
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop6(2: u32);
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := move test_loop6(2: u32)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> ⊥ : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@24 := copy x;
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@24 := copy x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-copy x
-
-[Debug] 
-**About to evaluate statement**: [
-  var@23 := move var@24 == 2: u32;
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> s@15 : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@23 := move var@24 == 2: u32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> s@15 : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> s@15 : u32 ;
-}
-
-
-- op:
-move var@24
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-2: u32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@22 := ¬ move var@23;
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> s@16 : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@22 := ¬ move var@23
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> s@16 : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> s@16 : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@23
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@22);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> s@17 : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@22)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> s@17 : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> true ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-- op:
-move var@22
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@0 : u32 ;
-  Some (var@2) -> ⊥ : bool ;
-  Some (var@3) -> ⊥ : bool ;
-  Some (var@4) -> ⊥ : u32 ;
-  Some (x) -> s@3 : u32 ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : u32 ;
-  Some (x) -> s@6 : u32 ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : u32 ;
-  Some (x) -> s@9 : u32 ;
-  Some (var@14) -> ⊥ : bool ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : u32 ;
-  Some (x) -> s@12 : u32 ;
-  Some (var@18) -> ⊥ : bool ;
-  Some (var@19) -> ⊥ : bool ;
-  Some (var@20) -> ⊥ : u32 ;
-  Some (x) -> s@15 : u32 ;
-  Some (var@22) -> ⊥ : bool ;
-  Some (var@23) -> ⊥ : bool ;
-  Some (var@24) -> ⊥ : u32 ;
-}
-
-
-
-[Debug] test_function_symbolic: id_mut_mut_test1
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: i32;
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@8 := copy *(px);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: i32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-- op:
-0: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@8 := copy *(px);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@8 := copy *(px);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  ppx := &mut px
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@8 := copy *(px);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := &two-phase *(ppx)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@8 := copy *(px);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] activate_inactivated_mut_borrow: resulting value:
-&mut@0 (0: i32)
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@5
-
-[Debug] 
-**About to evaluate statement**: [
-  *(*(ppy)) := 1: i32;
-  var@8 := copy *(px);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *(*(ppy)) := 1: i32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-}
-
-
-- op:
-1: i32
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@1 mut (i32))
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (s@1 : &r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, proj_loans (s@1 : &r@1 mut (i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, proj_loans (s@1 : &r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
-}
-
-
-[Debug] expand_symbolic_value: s@1 : &r@1 mut (i32)
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (s@1 : &r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, proj_loans (s@1 : &r@1 mut (i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, proj_loans (s@1 : &r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (s@2 : i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  None -> 1: i32 ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := copy *(px);
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := copy *(px)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-- op:
-copy *(px)
-
-[Debug] end borrow: 1:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 2))
-[Debug] end borrow: 2:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-[Debug] end borrow: 2: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
-[Debug] end_abstraction: 0
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-[Debug] end_abstraction: 0
-- context after parent abstractions ended:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-[Debug] end borrow: 3:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-[Debug] give_back:
-- bid: 3
-- content: &mut@3 (&mut@4 (1: i32))
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-[Debug] give_back_value:
-- bid: 3
-- value: &mut@4 (1: i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-[Debug] end_abstraction: 0
-- context after loans ended:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    @ended_mut_loan{ given_back=@ignored_mut_borrow(None, 1: i32); child=@ignored_mut_loan(4, proj_loans (s@2 : i32)) }
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] give_back_value:
-- bid: 2
-- value: s@3 : &r@1 mut (i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    ⊥ : &r@0 mut (&r@1 mut (i32)),
-    @ended_mut_loan{ given_back=@ignored_mut_borrow(None, 1: i32); child=@ignored_mut_loan(4, proj_loans (s@2 : i32)) }
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-[Debug] end_abstraction: 0
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-- new context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (s@3 : &r@1 mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] end borrow: 1:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (s@3 : &r@1 mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] give_back:
-- bid: 1
-- content: &mut@1 (s@3 : &r@1 mut (i32))
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-[Debug] give_back_value:
-- bid: 1
-- value: s@3 : &r@1 mut (i32)
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-[Debug] expand_symbolic_value: s@3 : &r@1 mut (i32)
-
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> s@3 : &r@1 mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-- new context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := move var@8 == 1: i32;
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@4 : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := move var@8 == 1: i32
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@4 : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> s@4 : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-- op:
-move var@8
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-- op:
-1: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@6 := ¬ move var@7;
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@5 : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@6 := ¬ move var@7
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@5 : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> s@5 : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-- op:
-move var@7
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@6);
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> s@6 : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@6)
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> s@6 : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> true ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-- op:
-move var@6
-
-[Debug] 
-**About to evaluate statement**: [
-  var@11 := copy x;
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@11 := copy x
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-- op:
-copy x
-
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 1)
-[Debug] end_abstraction: 1
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] end_abstraction: 1
-- context after parent abstractions ended:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] end borrow: 5:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] give_back:
-- bid: 5
-- content: &mut@5 (s@4 : i32)
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-[Debug] give_back_value:
-- bid: 5
-- value: s@4 : i32
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-[Debug] end borrow: 4:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] end borrow: 4: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 1)
-[Debug] end borrow: 4:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-[Debug] give_back:
-- bid: 4
-- content: &mut@4 (1: i32)
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=⊥ : &r@1 mut (i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-[Debug] end_abstraction: 1
-- context after loans ended:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=⊥ : &r@1 mut (i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-[Debug] give_back_value:
-- bid: 0
-- value: s@7 : i32
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=⊥ : &r@1 mut (i32)),
-    @ended_ignored_mut_loan{ given_back=⊥ : &r@1 mut (i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-[Debug] end_abstraction: 1
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@5 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-}
-
-
-- new context:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := move var@11 == 1: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@7 : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := move var@11 == 1: i32
-]
-
-**Context**:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@7 : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@7 : i32 ;
-}
-
-
-- op:
-move var@11
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-- op:
-1: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@8 : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@9 := ¬ move var@10
-]
-
-**Context**:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@8 : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@8 : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@10
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@9);
-  return
-]
-
-**Context**:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> s@9 : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  assert(¬move var@9)
-]
-
-**Context**:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> s@9 : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> true ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@9
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@6) -> ⊥ : bool ;
-  Some (var@7) -> ⊥ : bool ;
-  Some (var@8) -> ⊥ : i32 ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] test_function_symbolic: id_mut_mut_test2
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: i32;
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  x := 0: i32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-- op:
-0: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  ppx := &mut px
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := &two-phase *(ppx)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] activate_inactivated_mut_borrow: resulting value:
-&mut@0 (0: i32)
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@5
-
-[Debug] 
-**About to evaluate statement**: [
-  *(*(ppy)) := 1: i32;
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *(*(ppy)) := 1: i32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-}
-
-
-- op:
-1: i32
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@1 mut (i32))
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (s@1 : &r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, proj_loans (s@1 : &r@1 mut (i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, proj_loans (s@1 : &r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
-}
-
-
-[Debug] expand_symbolic_value: s@1 : &r@1 mut (i32)
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (s@1 : &r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, proj_loans (s@1 : &r@1 mut (i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, proj_loans (s@1 : &r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
-}
-
-
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (s@2 : i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  None -> 1: i32 ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  y := 2: i32;
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  y := 2: i32
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⊥ : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-- op:
-2: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  py := &mut y;
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 2: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  py := &mut y
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> 2: i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := &mut *(py);
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (2: i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@8 := &mut *(py)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (2: i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *(ppy) := move var@8;
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> &mut@6 (2: i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  *(ppy) := move var@8
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> &mut@6 (2: i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> &mut@6 (2: i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-}
-
-
-- op:
-move var@8
-
-[Debug] end borrow: 4:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⊥ : &'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  None -> &mut@6 (2: i32) ;
-  None -> &mut@4 (1: i32) ;
-}
-
-[Debug] give_back:
-- bid: 4
-- content: &mut@4 (1: i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⊥ : &'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  None -> &mut@6 (2: i32) ;
-  None -> ⊥ : &'_ mut (i32) ;
-}
-
-
-[Debug] give_back_value:
-- bid: 4
-- value: 1: i32
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⊥ : &'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  None -> &mut@6 (2: i32) ;
-  None -> ⊥ : &'_ mut (i32) ;
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@11 := copy *(px);
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@11 := copy *(px)
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-
-- op:
-copy *(px)
-
-[Debug] end borrow: 1:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 2))
-[Debug] end borrow: 2:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-[Debug] end borrow: 2: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
-[Debug] end_abstraction: 0
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-[Debug] end_abstraction: 0
-- context after parent abstractions ended:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-[Debug] end borrow: 3:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-[Debug] give_back:
-- bid: 3
-- content: &mut@3 (&mut@6 (2: i32))
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-
-[Debug] give_back_value:
-- bid: 3
-- value: &mut@6 (2: i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-
-[Debug] end_abstraction: 0
-- context after loans ended:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    @ended_mut_loan{ given_back=@ignored_mut_borrow(None, 2: i32); child=@ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)} }
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-[Debug] give_back_value:
-- bid: 2
-- value: s@3 : &r@1 mut (i32)
-- context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    ⊥ : &r@0 mut (&r@1 mut (i32)),
-    @ended_mut_loan{ given_back=@ignored_mut_borrow(None, 2: i32); child=@ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)} }
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-[Debug] end_abstraction: 0
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@6 (2: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ended_ignored_mut_loan{ given_back=1: i32; child: proj_loans (s@2 : i32)}⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) })
-  }
-}
-
-
-- new context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (s@3 : &r@1 mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-[Debug] end borrow: 1:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (s@3 : &r@1 mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-[Debug] give_back:
-- bid: 1
-- content: &mut@1 (s@3 : &r@1 mut (i32))
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-[Debug] give_back_value:
-- bid: 1
-- value: s@3 : &r@1 mut (i32)
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-[Debug] expand_symbolic_value: s@3 : &r@1 mut (i32)
-
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> s@3 : &r@1 mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-- new context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := move var@11 == 2: i32;
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@4 : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@10 := move var@11 == 2: i32
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@4 : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> s@4 : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-- op:
-move var@11
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-- op:
-2: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  var@9 := ¬ move var@10;
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
-  return
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@5 : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  var@9 := ¬ move var@10
-]
-
-**Context**:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@5 : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@5 : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@10
+3: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@9);
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@10 := ¬ move var@11;
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> s@6 : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> s@7 : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@9)
+  var@10 := ¬ move var@11
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> s@6 : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> s@7 : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> true ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> s@7 : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@9
+move var@11
 
 [Debug] 
 **About to evaluate statement**: [
-  *(px) := 3: i32;
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  assert(¬move var@10);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> s@8 : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(px) := 3: i32
+  assert(¬move var@10)
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> s@8 : bool ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (s@4 : i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> true ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-3: i32
+move var@10
 
 [Debug] 
 **About to evaluate statement**: [
-  var@14 := copy x;
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  x := move test_loop4(20: u32);
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@14 := copy x
+  x := move test_loop4(20: u32)
 ]
 
 **Context**:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-copy x
+20: u32
 
-[Debug] end borrow: 0:
-- original context:
-# Ended regions: {0}
+[Debug] 
+**About to evaluate statement**: [
+  var@16 := copy x;
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
+  return
+]
+
+**Context**:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
-[Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 1)
-[Debug] end_abstraction: 1
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
 
-[Debug] end_abstraction: 1
-- context after parent abstractions ended:
-# Ended regions: {0}
+[Debug] 
+**About to evaluate statement**: [
+  var@16 := copy x
+]
+
+**Context**:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
-[Debug] end borrow: 7:
-- original context:
-# Ended regions: {0}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
 
-[Debug] give_back:
-- bid: 7
-- content: &mut@7 (3: i32)
-- context:
-# Ended regions: {0}
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
-[Debug] give_back_value:
-- bid: 7
-- value: 3: i32
-- context:
-# Ended regions: {0}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
+- op:
+copy x
 
+[Debug] 
+**About to evaluate statement**: [
+  var@15 := move var@16 == 1: u32;
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
+  return
+]
 
-[Debug] end_abstraction: 1
-- context after loans ended:
-# Ended regions: {0}
+**Context**:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=3: i32; child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> s@9 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
-[Debug] give_back_value:
-- bid: 0
-- value: s@7 : i32
-- context:
-# Ended regions: {0}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=3: i32; child=proj_loans (s@4 : i32) }; child=⊥ : &r@1 mut (i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
-}
 
+[Debug] 
+**About to evaluate statement**: [
+  var@15 := move var@16 == 1: u32
+]
 
-[Debug] give_back_value:
-- bid: 6
-- value: s@8 : i32
-- context:
-# Ended regions: {0}
+**Context**:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=3: i32; child=proj_loans (s@4 : i32) }; child=⊥ : &r@1 mut (i32)),
-    @ended_ignored_mut_loan{ given_back=⊥ : &r@1 mut (i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> s@9 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
-[Debug] end_abstraction: 1
-- original context:
-# Ended regions: {0}
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@7 (3: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (⌊mut@6⌋) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@7, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@6 (2: i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
-  }
+  Some (var@16) -> s@9 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
-- new context:
-# Ended regions: {0, 1}
+- op:
+move var@16
+
+[Debug] eval_operand:
+- ctx:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
+
+- op:
+1: u32
+
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := move var@14 == 1: i32;
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@14 := ¬ move var@15;
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@7 : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> s@10 : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := move var@14 == 1: i32
+  var@14 := ¬ move var@15
 ]
 
 **Context**:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@7 : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] eval_operand:
-- ctx:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> s@7 : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> s@10 : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
-- op:
-move var@14
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> s@10 : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-1: i32
+move var@15
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := ¬ move var@13;
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  assert(¬move var@14);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> s@9 : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> s@11 : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := ¬ move var@13
+  assert(¬move var@14)
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> s@9 : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> s@11 : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> s@9 : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> true ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@13
+move var@14
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@12);
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  x := move test_loop5(2: u32);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> s@10 : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@12)
+  x := move test_loop5(2: u32)
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> s@10 : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> true ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@12
+2: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@17 := copy y;
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@20 := copy x;
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@17 := copy y
+  var@20 := copy x
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-copy y
-
-[Debug] end borrow: 5:
-- original context:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> &mut@5 (s@8 : i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-[Debug] give_back:
-- bid: 5
-- content: &mut@5 (s@8 : i32)
-- context:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-[Debug] give_back_value:
-- bid: 5
-- value: s@8 : i32
-- context:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> ⌊mut@5⌋ ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  var@16 := move var@17 == 3: i32;
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@19 := move var@20 == 2: u32;
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@8 : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> s@12 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@16 := move var@17 == 3: i32
+  var@19 := move var@20 == 2: u32
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@8 : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> s@12 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> s@8 : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> s@12 : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@17
+move var@20
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-3: i32
+2: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@15 := ¬ move var@16;
-  assert(¬move var@15);
+  var@18 := ¬ move var@19;
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> s@11 : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> s@13 : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@15 := ¬ move var@16
+  var@18 := ¬ move var@19
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> s@11 : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> s@13 : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> s@11 : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> s@13 : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@16
+move var@19
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@15);
+  assert(¬move var@18);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> s@12 : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> s@14 : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@15)
+  assert(¬move var@18)
 ]
 
 **Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> s@12 : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> s@14 : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
-  Some (var@15) -> true ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
-}
-
-
-- op:
-move var@15
-
-[Debug] 
-**About to evaluate statement**: [
-  return
-]
-
-**Context**:
-# Ended regions: {0, 1}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@7 : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (y) -> s@8 : i32 ;
-  Some (py) -> ⊥ : &'_ mut (i32) ;
-  Some (var@8) -> ⊥ : &'_ mut (i32) ;
-  Some (var@9) -> ⊥ : bool ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
   Some (var@10) -> ⊥ : bool ;
-  Some (var@11) -> ⊥ : i32 ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : bool ;
-  Some (var@14) -> ⊥ : i32 ;
+  Some (var@11) -> ⊥ : bool ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
   Some (var@15) -> ⊥ : bool ;
-  Some (var@16) -> ⊥ : bool ;
-  Some (var@17) -> ⊥ : i32 ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> true ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
+- op:
+move var@18
 
-[Debug] test_function_symbolic: id_mut_mut_test3
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32;
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  x := move test_loop6(2: u32);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -146218,26 +132332,37 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  x := 0: i32
+  x := move test_loop6(2: u32)
 ]
 
 **Context**:
@@ -146247,19 +132372,30 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -146272,116 +132408,42 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⊥ : i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> ⊥ : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-0: i32
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x;
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-}
-
-
-
-[Debug] 
-**About to evaluate statement**: [
-  px := &mut x
-]
-
-**Context**:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> 0: i32 ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-}
-
-
+2: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  ppx := &mut px;
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@24 := copy x;
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -146392,26 +132454,37 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppx := &mut px
+  var@24 := copy x
 ]
 
 **Context**:
@@ -146421,69 +132494,78 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@0 (0: i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@5 := &two-phase *(ppx);
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
+- op:
+copy x
 
 [Debug] 
 **About to evaluate statement**: [
-  var@5 := &two-phase *(ppx)
+  var@23 := move var@24 == 2: u32;
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
+  return
 ]
 
 **Context**:
@@ -146493,39 +132575,37 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> s@15 : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5);
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
+  var@23 := move var@24 == 2: u32
 ]
 
 **Context**:
@@ -146535,54 +132615,72 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> s@15 : u32 ;
 }
 
 
 
-[Debug] 
-**About to evaluate statement**: [
-  ppy := move id_mut_mut<i32>(move var@5)
-]
-
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> s@15 : u32 ;
 }
 
 
+- op:
+move var@24
 
-[Debug] activate_inactivated_mut_borrow: resulting value:
-&mut@0 (0: i32)
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -146591,39 +132689,40 @@ move var@15
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> &mut@2 (&mut@0 (0: i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-move var@5
+2: u32
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppy)) := 1: i32;
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@22 := ¬ move var@23;
+  assert(¬move var@22);
   return
 ]
 
@@ -146634,34 +132733,37 @@ move var@5
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> s@16 : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppy)) := 1: i32
+  var@22 := ¬ move var@23
 ]
 
 **Context**:
@@ -146671,27 +132773,30 @@ move var@5
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> s@16 : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
@@ -146704,216 +132809,158 @@ move var@5
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> s@16 : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 - op:
-1: i32
-
-[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@1 mut (i32))
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
-}
+move var@23
 
+[Debug] 
+**About to evaluate statement**: [
+  assert(¬move var@22);
+  return
+]
 
-- new context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (s@1 : &r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, proj_loans (s@1 : &r@1 mut (i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, proj_loans (s@1 : &r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> s@17 : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
-[Debug] expand_symbolic_value: s@1 : &r@1 mut (i32)
-
-- original context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (s@1 : &r@1 mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, proj_loans (s@1 : &r@1 mut (i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, proj_loans (s@1 : &r@1 mut (i32)))
-  }
-  None -> 1: i32 ;
-}
 
+[Debug] 
+**About to evaluate statement**: [
+  assert(¬move var@22)
+]
 
-- new context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (s@2 : i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  None -> 1: i32 ;
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> s@17 : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
-[Debug] 
-**About to evaluate statement**: [
-  var@7 := &two-phase *(ppy);
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
-  return
-]
 
-**Context**:
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> true ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
+- op:
+move var@22
 
 [Debug] 
 **About to evaluate statement**: [
-  var@7 := &two-phase *(ppy)
+  return
 ]
 
 **Context**:
@@ -146923,43 +132970,51 @@ move var@5
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
+  Some (x) -> s@0 : u32 ;
+  Some (var@2) -> ⊥ : bool ;
+  Some (var@3) -> ⊥ : bool ;
+  Some (var@4) -> ⊥ : u32 ;
+  Some (x) -> s@3 : u32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : u32 ;
+  Some (x) -> s@6 : u32 ;
+  Some (var@10) -> ⊥ : bool ;
   Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
+  Some (var@12) -> ⊥ : u32 ;
+  Some (x) -> s@9 : u32 ;
+  Some (var@14) -> ⊥ : bool ;
+  Some (var@15) -> ⊥ : bool ;
+  Some (var@16) -> ⊥ : u32 ;
+  Some (x) -> s@12 : u32 ;
+  Some (var@18) -> ⊥ : bool ;
+  Some (var@19) -> ⊥ : bool ;
+  Some (var@20) -> ⊥ : u32 ;
+  Some (x) -> s@15 : u32 ;
+  Some (var@22) -> ⊥ : bool ;
+  Some (var@23) -> ⊥ : bool ;
+  Some (var@24) -> ⊥ : u32 ;
 }
 
 
 
+[Debug] test_function_symbolic: id_mut_mut_test1
 [Debug] 
 **About to evaluate statement**: [
-  ppz := move id_mut_mut<i32>(move var@7);
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  x := 0: i32;
+  px := &mut x;
+  ppx := &mut px;
+  var@5 := &two-phase *(ppx);
+  ppy := move id_mut_mut<i32>(move var@5);
+  *(*(ppy)) := 1: i32;
+  var@8 := copy *(px);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
@@ -146970,34 +133025,24 @@ move var@5
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (@shared_loan({5}, &mut@4 (1: i32))) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⌊inactivated_mut@5⌋ ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  ppz := move id_mut_mut<i32>(move var@7)
+  x := 0: i32
 ]
 
 **Context**:
@@ -147007,33 +133052,21 @@ move var@5
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (@shared_loan({5}, &mut@4 (1: i32))) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⌊inactivated_mut@5⌋ ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] activate_inactivated_mut_borrow: resulting value:
-&mut@4 (1: i32)
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -147042,44 +133075,38 @@ move var@5
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (x) -> ⊥ : i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> &mut@5 (&mut@4 (1: i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@7
+0: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppz)) := 2: i32;
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  px := &mut x;
+  ppx := &mut px;
+  var@5 := &two-phase *(ppx);
+  ppy := move id_mut_mut<i32>(move var@5);
+  *(*(ppy)) := 1: i32;
+  var@8 := copy *(px);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
@@ -147090,42 +133117,24 @@ move var@7
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (x) -> 0: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> s@3 : &r@2 mut (&r@3 mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    proj_loans (s@3 : &r@2 mut (&r@3 mut (i32)))
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    proj_loans (s@3 : &r@2 mut (&r@3 mut (i32)))
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  *(*(ppz)) := 2: i32
+  px := &mut x
 ]
 
 **Context**:
@@ -147135,41 +133144,39 @@ move var@7
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (x) -> 0: i32 ;
+  Some (px) -> ⊥ : &'_ mut (i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> s@3 : &r@2 mut (&r@3 mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    proj_loans (s@3 : &r@2 mut (&r@3 mut (i32)))
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    proj_loans (s@3 : &r@2 mut (&r@3 mut (i32)))
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
-[Debug] eval_operand:
-- ctx:
+[Debug] 
+**About to evaluate statement**: [
+  ppx := &mut px;
+  var@5 := &two-phase *(ppx);
+  ppy := move id_mut_mut<i32>(move var@5);
+  *(*(ppy)) := 1: i32;
+  var@8 := copy *(px);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147177,43 +133184,26 @@ move var@7
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (px) -> &mut@0 (0: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> s@3 : &r@2 mut (&r@3 mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    proj_loans (s@3 : &r@2 mut (&r@3 mut (i32)))
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    proj_loans (s@3 : &r@2 mut (&r@3 mut (i32)))
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
-- op:
-2: i32
 
-[Debug] expand_symbolic_value: s@3 : &r@2 mut (&r@3 mut (i32))
+[Debug] 
+**About to evaluate statement**: [
+  ppx := &mut px
+]
 
-- original context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147221,81 +133211,37 @@ move var@7
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (px) -> &mut@0 (0: i32) ;
+  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> s@3 : &r@2 mut (&r@3 mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    proj_loans (s@3 : &r@2 mut (&r@3 mut (i32)))
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    proj_loans (s@3 : &r@2 mut (&r@3 mut (i32)))
-  }
-  None -> 2: i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
-- new context:
-# Ended regions: {}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (s@4 : &r@3 mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, proj_loans (s@4 : &r@3 mut (i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, proj_loans (s@4 : &r@3 mut (i32)))
-  }
-  None -> 2: i32 ;
-}
-
 
-[Debug] expand_symbolic_value: s@4 : &r@3 mut (i32)
+[Debug] 
+**About to evaluate statement**: [
+  var@5 := &two-phase *(ppx);
+  ppy := move id_mut_mut<i32>(move var@5);
+  *(*(ppy)) := 1: i32;
+  var@8 := copy *(px);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
+  return
+]
 
-- original context:
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147304,38 +133250,25 @@ move var@7
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (s@4 : &r@3 mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, proj_loans (s@4 : &r@3 mut (i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, proj_loans (s@4 : &r@3 mut (i32)))
-  }
-  None -> 2: i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
-- new context:
+
+[Debug] 
+**About to evaluate statement**: [
+  var@5 := &two-phase *(ppx)
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147344,47 +133277,31 @@ move var@7
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppx) -> &mut@1 (&mut@0 (0: i32)) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (s@5 : i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
-  None -> 2: i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
+
 [Debug] 
 **About to evaluate statement**: [
-  var@10 := copy *(px);
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  ppy := move id_mut_mut<i32>(move var@5);
+  *(*(ppy)) := 1: i32;
+  var@8 := copy *(px);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
@@ -147397,40 +133314,22 @@ move var@7
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@10 := copy *(px)
+  ppy := move id_mut_mut<i32>(move var@5)
 ]
 
 **Context**:
@@ -147442,37 +133341,21 @@ move var@7
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (ppx) -> &mut@1 (@shared_loan({2}, &mut@0 (0: i32))) ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@5) -> ⌊inactivated_mut@2⌋ ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
+[Debug] activate_inactivated_mut_borrow: resulting value:
+&mut@0 (0: i32)
 [Debug] eval_operand:
 - ctx:
 # Ended regions: {}
@@ -147484,40 +133367,35 @@ move var@7
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
+  Some (var@5) -> &mut@2 (&mut@0 (0: i32)) ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 - op:
-copy *(px)
+move var@5
 
-[Debug] end borrow: 1:
-- original context:
+[Debug] 
+**About to evaluate statement**: [
+  *(*(ppy)) := 1: i32;
+  var@8 := copy *(px);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147527,77 +133405,32 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
   }
   abs@1{parents={0}}{regions={1}} {
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
   }
 }
 
-[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 2))
-[Debug] end borrow: 2:
-- original context:
-# Ended regions: {}
-# 1 frame(s)
 
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@0{parents={}}{regions={0}} {
-    &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
-  }
-  abs@1{parents={0}}{regions={1}} {
-    @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
-}
 
-[Debug] end borrow: 2: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
-[Debug] end_abstraction: 0
-- original context:
+[Debug] 
+**About to evaluate statement**: [
+  *(*(ppy)) := 1: i32
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147607,36 +133440,28 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
   }
   abs@1{parents={0}}{regions={1}} {
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
   }
 }
 
-[Debug] end_abstraction: 0
-- context after parent abstractions ended:
+
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147646,35 +133471,30 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
   }
   abs@1{parents={0}}{regions={1}} {
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
   }
 }
 
-[Debug] end borrow: 3:
+
+- op:
+1: i32
+
+[Debug] expand_symbolic_value: s@0 : &r@0 mut (&r@1 mut (i32))
+
 - original context:
 # Ended regions: {}
 # 1 frame(s)
@@ -147685,37 +133505,27 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> s@0 : &r@0 mut (&r@1 mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
   }
   abs@1{parents={0}}{regions={1}} {
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
+    proj_loans (s@0 : &r@0 mut (&r@1 mut (i32)))
   }
+  None -> 1: i32 ;
 }
 
-[Debug] end borrow: 3: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 5))
-[Debug] end borrow: 5:
-- original context:
+
+- new context:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147725,36 +133535,28 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (s@1 : &r@1 mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
+    ⌊mut@3, proj_loans (s@1 : &r@1 mut (i32))⌋
   }
   abs@1{parents={0}}{regions={1}} {
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
+    @ignored_mut_loan(3, proj_loans (s@1 : &r@1 mut (i32)))
   }
+  None -> 1: i32 ;
 }
 
-[Debug] end borrow: 5: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 2)
-[Debug] end_abstraction: 2
+
+[Debug] expand_symbolic_value: s@1 : &r@1 mut (i32)
+
 - original context:
 # Ended regions: {}
 # 1 frame(s)
@@ -147765,36 +133567,27 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (s@1 : &r@1 mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
+    ⌊mut@3, proj_loans (s@1 : &r@1 mut (i32))⌋
   }
   abs@1{parents={0}}{regions={1}} {
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
-  }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
+    @ignored_mut_loan(3, proj_loans (s@1 : &r@1 mut (i32)))
   }
+  None -> 1: i32 ;
 }
 
-[Debug] end_abstraction: 2
-- context after parent abstractions ended:
+
+- new context:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147804,16 +133597,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (&mut@4 (s@2 : i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -147822,18 +133613,24 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
+  None -> 1: i32 ;
 }
 
-[Debug] end borrow: 6:
-- original context:
+
+[Debug] 
+**About to evaluate statement**: [
+  var@8 := copy *(px);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
+  return
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147843,16 +133640,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -147861,20 +133656,16 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
 }
 
-[Debug] give_back:
-- bid: 6
-- content: &mut@6 (&mut@7 (2: i32))
-- context:
+
+
+[Debug] 
+**About to evaluate statement**: [
+  var@8 := copy *(px)
+]
+
+**Context**:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147884,16 +133675,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -147902,21 +133691,12 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
 }
 
 
-[Debug] give_back_value:
-- bid: 6
-- value: &mut@7 (2: i32)
-- context:
+
+[Debug] eval_operand:
+- ctx:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147926,16 +133706,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -147944,19 +133722,14 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
 }
 
 
-[Debug] end_abstraction: 2
-- context after loans ended:
+- op:
+copy *(px)
+
+[Debug] end borrow: 1:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -147966,16 +133739,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -147984,20 +133755,11 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    @ended_mut_loan{ given_back=@ignored_mut_borrow(None, 2: i32); child=@ignored_mut_loan(7, proj_loans (s@5 : i32)) }
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
 }
 
-[Debug] give_back_value:
-- bid: 5
-- value: s@6 : &r@3 mut (i32)
-- context:
+[Debug] end borrow: 1: found outer borrows/abs:(InterpreterBorrowsCore.InnerLoans (InterpreterBorrowsCore.Borrow 2))
+[Debug] end borrow: 2:
+- original context:
 # Ended regions: {}
 # 1 frame(s)
 
@@ -148007,16 +133769,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -148025,18 +133785,10 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@2{parents={}}{regions={2}} {
-    ⊥ : &r@2 mut (&r@3 mut (i32)),
-    @ended_mut_loan{ given_back=@ignored_mut_borrow(None, 2: i32); child=@ignored_mut_loan(7, proj_loans (s@5 : i32)) }
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
 }
 
-
-[Debug] end_abstraction: 2
+[Debug] end borrow: 2: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 0)
+[Debug] end_abstraction: 0
 - original context:
 # Ended regions: {}
 # 1 frame(s)
@@ -148047,16 +133799,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -148065,19 +133815,11 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
 }
 
-
-- new context:
-# Ended regions: {2}
+[Debug] end_abstraction: 0
+- context after parent abstractions ended:
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
@@ -148086,16 +133828,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (s@6 : &r@3 mut (i32)) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -148104,15 +133844,11 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
 }
 
 [Debug] end borrow: 3:
 - original context:
-# Ended regions: {2}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
@@ -148121,16 +133857,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (s@6 : &r@3 mut (i32)) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -148139,17 +133873,13 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
 }
 
 [Debug] give_back:
 - bid: 3
-- content: &mut@3 (s@6 : &r@3 mut (i32))
+- content: &mut@3 (&mut@4 (1: i32))
 - context:
-# Ended regions: {2}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
@@ -148160,14 +133890,12 @@ copy *(px)
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -148176,18 +133904,14 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
 }
 
 
 [Debug] give_back_value:
 - bid: 3
-- value: s@6 : &r@3 mut (i32)
+- value: &mut@4 (1: i32)
 - context:
-# Ended regions: {2}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
@@ -148198,14 +133922,12 @@ copy *(px)
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -148214,16 +133936,12 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
 }
 
 
 [Debug] end_abstraction: 0
 - context after loans ended:
-# Ended regions: {2}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
@@ -148234,33 +133952,27 @@ copy *(px)
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
-    @ended_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child=@ignored_mut_loan(4, proj_loans (s@2 : i32)) }
+    @ended_mut_loan{ given_back=@ignored_mut_borrow(None, 1: i32); child=@ignored_mut_loan(4, proj_loans (s@2 : i32)) }
   }
   abs@1{parents={0}}{regions={1}} {
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 [Debug] give_back_value:
 - bid: 2
-- value: s@7 : &r@1 mut (i32)
+- value: s@3 : &r@1 mut (i32)
 - context:
-# Ended regions: {2}
+# Ended regions: {}
 # 1 frame(s)
 
 # Frame 0:
@@ -148271,25 +133983,19 @@ copy *(px)
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     ⊥ : &r@0 mut (&r@1 mut (i32)),
-    @ended_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child=@ignored_mut_loan(4, proj_loans (s@2 : i32)) }
+    @ended_mut_loan{ given_back=@ignored_mut_borrow(None, 1: i32); child=@ignored_mut_loan(4, proj_loans (s@2 : i32)) }
   }
   abs@1{parents={0}}{regions={1}} {
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148305,16 +134011,14 @@ copy *(px)
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
   Some (ppx) -> &mut@1 (⌊mut@2⌋) ;
-  Some (ppy) -> &mut@3 (⌊mut@5⌋) ;
+  Some (ppy) -> &mut@3 (&mut@4 (1: i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> &mut@6 (&mut@7 (2: i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@0{parents={}}{regions={0}} {
     &mut@2 (@ignored_mut_borrow(None, 0: i32)),
     ⌊mut@3, @ignored_mut_loan(4, proj_loans (s@2 : i32))⌋
@@ -148323,19 +134027,11 @@ copy *(px)
     @ignored_mut_borrow(Some (2), &mut@0 (0: i32)),
     @ignored_mut_loan(3, ⌊mut@4, proj_loans (s@2 : i32)⌋)
   }
-  abs@2{parents={}}{regions={2}} {
-    &mut@5 (@ignored_mut_borrow(None, 1: i32)),
-    ⌊mut@6, @ignored_mut_loan(7, proj_loans (s@5 : i32))⌋
-  }
-  abs@3{parents={2}}{regions={3}} {
-    @ignored_mut_borrow(Some (5), &mut@4 (1: i32)),
-    @ignored_mut_loan(6, ⌊mut@7, proj_loans (s@5 : i32)⌋)
-  }
 }
 
 
 - new context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -148343,30 +134039,24 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (s@7 : &r@1 mut (i32)) ;
+  Some (ppx) -> &mut@1 (s@3 : &r@1 mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@7 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 [Debug] end borrow: 1:
 - original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -148374,32 +134064,26 @@ copy *(px)
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
   Some (px) -> ⌊mut@1⌋ ;
-  Some (ppx) -> &mut@1 (s@7 : &r@1 mut (i32)) ;
+  Some (ppx) -> &mut@1 (s@3 : &r@1 mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@7 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 [Debug] give_back:
 - bid: 1
-- content: &mut@1 (s@7 : &r@1 mut (i32))
+- content: &mut@1 (s@3 : &r@1 mut (i32))
 - context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -148410,30 +134094,24 @@ copy *(px)
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@7 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 [Debug] give_back_value:
 - bid: 1
-- value: s@7 : &r@1 mut (i32)
+- value: s@3 : &r@1 mut (i32)
 - context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -148444,128 +134122,104 @@ copy *(px)
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@7 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
-[Debug] expand_symbolic_value: s@7 : &r@1 mut (i32)
+[Debug] expand_symbolic_value: s@3 : &r@1 mut (i32)
 
 - original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> s@7 : &r@1 mut (i32) ;
+  Some (px) -> s@3 : &r@1 mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@7 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@3 : &r@1 mut (i32)); child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 - new context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := move var@10 == 2: i32;
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@7 := move var@8 == 1: i32;
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@4 : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@8 : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148573,36 +134227,30 @@ copy *(px)
 
 [Debug] 
 **About to evaluate statement**: [
-  var@9 := move var@10 == 2: i32
+  var@7 := move var@8 == 1: i32
 ]
 
 **Context**:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@4 : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@8 : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148610,112 +134258,94 @@ copy *(px)
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> s@4 : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> s@8 : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 - op:
-move var@10
+move var@8
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 - op:
-2: i32
+1: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := ¬ move var@9;
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@6 := ¬ move var@7;
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@9 : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@5 : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148723,36 +134353,30 @@ move var@10
 
 [Debug] 
 **About to evaluate statement**: [
-  var@8 := ¬ move var@9
+  var@6 := ¬ move var@7
 ]
 
 **Context**:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@9 : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@5 : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148760,76 +134384,64 @@ move var@10
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> s@9 : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> s@5 : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> ⊥ : bool ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 - op:
-move var@9
+move var@7
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@8);
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  assert(¬move var@6);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> s@10 : bool ;
+  Some (var@6) -> s@6 : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148837,36 +134449,30 @@ move var@9
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@8)
+  assert(¬move var@6)
 ]
 
 **Context**:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> s@10 : bool ;
+  Some (var@6) -> s@6 : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148874,75 +134480,63 @@ move var@9
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> true ;
+  Some (var@6) -> true ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 - op:
-move var@8
+move var@6
 
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := copy x;
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@11 := copy x;
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148950,36 +134544,30 @@ move var@8
 
 [Debug] 
 **About to evaluate statement**: [
-  var@13 := copy x
+  var@11 := copy x
 ]
 
 **Context**:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -148987,32 +134575,26 @@ move var@8
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
@@ -149022,134 +134604,110 @@ copy x
 
 [Debug] end borrow: 0:
 - original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 [Debug] end borrow: 0: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 1)
 [Debug] end_abstraction: 1
 - original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 [Debug] end_abstraction: 1
 - context after parent abstractions ended:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
-[Debug] end borrow: 8:
+[Debug] end borrow: 5:
 - original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 [Debug] give_back:
-- bid: 8
-- content: &mut@8 (s@8 : i32)
+- bid: 5
+- content: &mut@5 (s@4 : i32)
 - context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -149160,30 +134718,24 @@ copy x
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 [Debug] give_back_value:
-- bid: 8
-- value: s@8 : i32
+- bid: 5
+- value: s@4 : i32
 - context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -149194,122 +134746,22 @@ copy x
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 [Debug] end borrow: 4:
 - original context:
-# Ended regions: {0, 2}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
-}
-
-[Debug] end borrow: 4: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 3)
-[Debug] end_abstraction: 3
-- original context:
-# Ended regions: {0, 2}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
-}
-
-[Debug] end_abstraction: 3
-- context after parent abstractions ended:
-# Ended regions: {0, 2}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
-}
-
-[Debug] end borrow: 7:
-- original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -149320,28 +134772,22 @@ copy x
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
-[Debug] end borrow: 7: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 3)
-[Debug] end borrow: 7:
+[Debug] end borrow: 4: found outer borrows/abs:(InterpreterBorrowsCore.OuterAbs 1)
+[Debug] end borrow: 4:
 - original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -149352,126 +134798,23 @@ copy x
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 [Debug] give_back:
-- bid: 7
-- content: &mut@7 (2: i32)
-- context:
-# Ended regions: {0, 2}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=⊥ : &r@3 mut (i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
-  }
-}
-
-
-[Debug] end_abstraction: 3
-- context after loans ended:
-# Ended regions: {0, 2}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=⊥ : &r@3 mut (i32); child: @ended_mut_loan{ given_back=2: i32; child=proj_loans (s@5 : i32) }}
-  }
-}
-
-[Debug] give_back_value:
 - bid: 4
-- value: s@11 : i32
+- content: &mut@4 (1: i32)
 - context:
-# Ended regions: {0, 2}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=⊥ : &r@3 mut (i32)),
-    @ended_ignored_mut_loan{ given_back=⊥ : &r@3 mut (i32); child: @ended_mut_loan{ given_back=2: i32; child=proj_loans (s@5 : i32) }}
-  }
-}
-
-
-[Debug] end_abstraction: 3
-- original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -149482,54 +134825,22 @@ copy x
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=⊥ : &r@1 mut (i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
-- new context:
-# Ended regions: {0, 2, 3}
-# 1 frame(s)
-
-# Frame 0:
-{
-  Some (var@0) -> ⊥ : () ;
-  Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> ⊥ : &'_ mut (i32) ;
-  Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
-  abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: @ended_mut_loan{ given_back=proj_borrows (s@11 : i32 <: i32); child=proj_loans (s@2 : i32) }}
-  }
-}
-
 [Debug] end_abstraction: 1
 - context after loans ended:
-# Ended regions: {0, 2, 3}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -149540,25 +134851,23 @@ copy x
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: @ended_mut_loan{ given_back=proj_borrows (s@11 : i32 <: i32); child=proj_loans (s@2 : i32) }}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=⊥ : &r@1 mut (i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
   }
 }
 
 [Debug] give_back_value:
 - bid: 0
-- value: s@12 : i32
+- value: s@7 : i32
 - context:
-# Ended regions: {0, 2, 3}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
@@ -149569,362 +134878,332 @@ copy x
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@8 : i32 <: i32); child=proj_loans (s@8 : i32) }; child=⊥ : &r@1 mut (i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: @ended_mut_loan{ given_back=proj_borrows (s@11 : i32 <: i32); child=proj_loans (s@2 : i32) }}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=@ended_mut_loan{ given_back=proj_borrows (s@4 : i32 <: i32); child=proj_loans (s@4 : i32) }; child=⊥ : &r@1 mut (i32)),
+    @ended_ignored_mut_loan{ given_back=⊥ : &r@1 mut (i32); child: @ended_mut_loan{ given_back=1: i32; child=proj_loans (s@2 : i32) }}
   }
 }
 
 
 [Debug] end_abstraction: 1
 - original context:
-# Ended regions: {0, 2}
+# Ended regions: {0}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
   Some (x) -> ⌊mut@0⌋ ;
-  Some (px) -> &mut@8 (s@8 : i32) ;
+  Some (px) -> &mut@5 (s@4 : i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
   abs@1{parents={}}{regions={1}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@8, proj_loans (s@8 : i32)⌋; child=&mut@0 (0: i32)),
-    @ended_ignored_mut_loan{ given_back=proj_borrows (s@6 : &r@3 mut (i32) <: &r@1 mut (i32)); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
-  }
-  abs@3{parents={}}{regions={3}} {
-    @ended_ignored_mut_borrow{ given_back_loans_proj=proj_loans (s@6 : &r@3 mut (i32)); child=&mut@4 (1: i32)),
-    @ended_ignored_mut_loan{ given_back=&mut@7 (2: i32); child: ⌊mut@7, proj_loans (s@5 : i32)⌋}
+    @ended_ignored_mut_borrow{ given_back_loans_proj=⌊mut@5, proj_loans (s@4 : i32)⌋; child=&mut@0 (0: i32)),
+    @ended_ignored_mut_loan{ given_back=&mut@4 (1: i32); child: ⌊mut@4, proj_loans (s@2 : i32)⌋}
   }
 }
 
 
 - new context:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := move var@13 == 2: i32;
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@10 := move var@11 == 1: i32;
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> s@12 : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@7 : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@12 := move var@13 == 2: i32
+  var@10 := move var@11 == 1: i32
 ]
 
 **Context**:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> s@12 : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@7 : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> s@12 : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> s@7 : i32 ;
 }
 
 
 - op:
-move var@13
+move var@11
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 - op:
-2: i32
+1: i32
 
 [Debug] 
 **About to evaluate statement**: [
-  var@11 := ¬ move var@12;
-  assert(¬move var@11);
+  var@9 := ¬ move var@10;
+  assert(¬move var@9);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@13 : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> s@8 : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  var@11 := ¬ move var@12
+  var@9 := ¬ move var@10
 ]
 
 **Context**:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@13 : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> s@8 : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> s@13 : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> s@8 : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@12
+move var@10
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@11);
+  assert(¬move var@9);
   return
 ]
 
 **Context**:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> s@14 : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> s@9 : bool ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] 
 **About to evaluate statement**: [
-  assert(¬move var@11)
+  assert(¬move var@9)
 ]
 
 **Context**:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> s@14 : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> s@9 : bool ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 
 [Debug] eval_operand:
 - ctx:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
-  Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> true ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
+  Some (var@9) -> true ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
 - op:
-move var@11
+move var@9
 
 [Debug] 
 **About to evaluate statement**: [
@@ -149932,25 +135211,23 @@ move var@11
 ]
 
 **Context**:
-# Ended regions: {0, 1, 2, 3}
+# Ended regions: {0, 1}
 # 1 frame(s)
 
 # Frame 0:
 {
   Some (var@0) -> ⊥ : () ;
-  Some (x) -> s@12 : i32 ;
+  Some (x) -> s@7 : i32 ;
   Some (px) -> ⊥ : &'_ mut (i32) ;
   Some (ppx) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (ppy) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
   Some (var@5) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (ppz) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@7) -> ⊥ : &'_ mut (&'_ mut (i32)) ;
-  Some (var@8) -> ⊥ : bool ;
+  Some (var@6) -> ⊥ : bool ;
+  Some (var@7) -> ⊥ : bool ;
+  Some (var@8) -> ⊥ : i32 ;
   Some (var@9) -> ⊥ : bool ;
-  Some (var@10) -> ⊥ : i32 ;
-  Some (var@11) -> ⊥ : bool ;
-  Some (var@12) -> ⊥ : bool ;
-  Some (var@13) -> ⊥ : i32 ;
+  Some (var@10) -> ⊥ : bool ;
+  Some (var@11) -> ⊥ : i32 ;
 }
 
 
-- 
cgit v1.2.3