Regenerate and fix the tests

23 files changed, 140 insertions, 51 deletions

diff --git a/tests/coq/arrays/Primitives.v b/tests/coq/arrays/Primitives.v
index 5ffda12f..b29fce43 100644
--- a/tests/coq/arrays/Primitives.v
+++ b/tests/coq/arrays/Primitives.v
@@ -564,6 +564,13 @@ Definition core_clone_CloneI128 : core_clone_Clone i128 := {|
   clone := fun x => Ok (core_clone_impls_CloneI128_clone x)
 |}.
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+Definition core_option_Option_unwrap (T : Type) (x : option T) : result T :=
+  match x with
+  | None => Fail_ Failure
+  | Some x => Ok x
+  end.
+
 (*** core::ops *)
 
 (* Trait declaration: [core::ops::index::Index] *)
diff --git a/tests/coq/betree/BetreeMain_Funs.v b/tests/coq/betree/BetreeMain_Funs.v
index 80518eab..c31713be 100644
--- a/tests/coq/betree/BetreeMain_Funs.v
+++ b/tests/coq/betree/BetreeMain_Funs.v
@@ -275,8 +275,8 @@ Fixpoint betree_Node_lookup_in_bindings
     Source: 'src/betree.rs', lines 819:4-819:90 *)
 Fixpoint betree_Node_apply_upserts
   (n : nat) (msgs : betree_List_t (u64 * betree_Message_t)) (prev : option u64)
-  (key : u64) (st : state) :
-  result (state * (u64 * (betree_List_t (u64 * betree_Message_t))))
+  (key : u64) :
+  result (u64 * (betree_List_t (u64 * betree_Message_t)))
   :=
   match n with
   | O => Fail_ OutOfFuel
@@ -292,15 +292,14 @@ Fixpoint betree_Node_apply_upserts
       | Betree_Message_Delete => Fail_ Failure
       | Betree_Message_Upsert s =>
         v <- betree_upsert_update prev s;
-        betree_Node_apply_upserts n1 msgs1 (Some v) key st
+        betree_Node_apply_upserts n1 msgs1 (Some v) key
       end)
     else (
-      p <- core_option_Option_unwrap u64 prev st;
-      let (st1, v) := p in
+      v <- core_option_Option_unwrap u64 prev;
       msgs1 <-
         betree_List_push_front (u64 * betree_Message_t) msgs (key,
           Betree_Message_Insert v);
-      Ok (st1, (v, msgs1)))
+      Ok (v, msgs1))
   end
 .
 
@@ -371,14 +370,13 @@ with betree_Node_lookup
             let (v, node1) := p4 in
             p5 <-
               betree_Node_apply_upserts n1 (Betree_List_Cons (k,
-                Betree_Message_Upsert ufs) l) v key st2;
-            let (st3, p6) := p5 in
-            let (v1, pending1) := p6 in
+                Betree_Message_Upsert ufs) l) v key;
+            let (v1, pending1) := p5 in
             msgs1 <- lookup_first_message_for_key_back pending1;
-            p7 <-
-              betree_store_internal_node node1.(betree_Internal_id) msgs1 st3;
-            let (st4, _) := p7 in
-            Ok (st4, (Some v1, Betree_Node_Internal node1))
+            p6 <-
+              betree_store_internal_node node1.(betree_Internal_id) msgs1 st2;
+            let (st3, _) := p6 in
+            Ok (st3, (Some v1, Betree_Node_Internal node1))
           end
       | Betree_List_Nil =>
         p2 <- betree_Internal_lookup_in_children n1 node key st1;
diff --git a/tests/coq/betree/BetreeMain_FunsExternal.v b/tests/coq/betree/BetreeMain_FunsExternal.v
index 2d77c4ed..099a2e8f 100644
--- a/tests/coq/betree/BetreeMain_FunsExternal.v
+++ b/tests/coq/betree/BetreeMain_FunsExternal.v
@@ -36,10 +36,4 @@ Axiom betree_utils_store_leaf_node
   : u64 -> betree_List_t (u64 * u64) -> state -> result (state * unit)
 .
 
-(** [core::option::{core::option::Option<T>}::unwrap]: forward function
-    Source: '/rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/core/src/option.rs', lines 932:4-932:34 *)
-Axiom core_option_Option_unwrap :
-  forall(T : Type), option T -> state -> result (state * T)
-.
-
 End BetreeMain_FunsExternal.
diff --git a/tests/coq/betree/Primitives.v b/tests/coq/betree/Primitives.v
index 5ffda12f..b29fce43 100644
--- a/tests/coq/betree/Primitives.v
+++ b/tests/coq/betree/Primitives.v
@@ -564,6 +564,13 @@ Definition core_clone_CloneI128 : core_clone_Clone i128 := {|
   clone := fun x => Ok (core_clone_impls_CloneI128_clone x)
 |}.
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+Definition core_option_Option_unwrap (T : Type) (x : option T) : result T :=
+  match x with
+  | None => Fail_ Failure
+  | Some x => Ok x
+  end.
+
 (*** core::ops *)
 
 (* Trait declaration: [core::ops::index::Index] *)
diff --git a/tests/coq/demo/Primitives.v b/tests/coq/demo/Primitives.v
index 5ffda12f..b29fce43 100644
--- a/tests/coq/demo/Primitives.v
+++ b/tests/coq/demo/Primitives.v
@@ -564,6 +564,13 @@ Definition core_clone_CloneI128 : core_clone_Clone i128 := {|
   clone := fun x => Ok (core_clone_impls_CloneI128_clone x)
 |}.
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+Definition core_option_Option_unwrap (T : Type) (x : option T) : result T :=
+  match x with
+  | None => Fail_ Failure
+  | Some x => Ok x
+  end.
+
 (*** core::ops *)
 
 (* Trait declaration: [core::ops::index::Index] *)
diff --git a/tests/coq/hashmap/Primitives.v b/tests/coq/hashmap/Primitives.v
index 5ffda12f..b29fce43 100644
--- a/tests/coq/hashmap/Primitives.v
+++ b/tests/coq/hashmap/Primitives.v
@@ -564,6 +564,13 @@ Definition core_clone_CloneI128 : core_clone_Clone i128 := {|
   clone := fun x => Ok (core_clone_impls_CloneI128_clone x)
 |}.
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+Definition core_option_Option_unwrap (T : Type) (x : option T) : result T :=
+  match x with
+  | None => Fail_ Failure
+  | Some x => Ok x
+  end.
+
 (*** core::ops *)
 
 (* Trait declaration: [core::ops::index::Index] *)
diff --git a/tests/coq/hashmap_on_disk/Primitives.v b/tests/coq/hashmap_on_disk/Primitives.v
index 5ffda12f..b29fce43 100644
--- a/tests/coq/hashmap_on_disk/Primitives.v
+++ b/tests/coq/hashmap_on_disk/Primitives.v
@@ -564,6 +564,13 @@ Definition core_clone_CloneI128 : core_clone_Clone i128 := {|
   clone := fun x => Ok (core_clone_impls_CloneI128_clone x)
 |}.
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+Definition core_option_Option_unwrap (T : Type) (x : option T) : result T :=
+  match x with
+  | None => Fail_ Failure
+  | Some x => Ok x
+  end.
+
 (*** core::ops *)
 
 (* Trait declaration: [core::ops::index::Index] *)
diff --git a/tests/coq/misc/Primitives.v b/tests/coq/misc/Primitives.v
index 5ffda12f..b29fce43 100644
--- a/tests/coq/misc/Primitives.v
+++ b/tests/coq/misc/Primitives.v
@@ -564,6 +564,13 @@ Definition core_clone_CloneI128 : core_clone_Clone i128 := {|
   clone := fun x => Ok (core_clone_impls_CloneI128_clone x)
 |}.
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+Definition core_option_Option_unwrap (T : Type) (x : option T) : result T :=
+  match x with
+  | None => Fail_ Failure
+  | Some x => Ok x
+  end.
+
 (*** core::ops *)
 
 (* Trait declaration: [core::ops::index::Index] *)
diff --git a/tests/coq/traits/Primitives.v b/tests/coq/traits/Primitives.v
index 5ffda12f..b29fce43 100644
--- a/tests/coq/traits/Primitives.v
+++ b/tests/coq/traits/Primitives.v
@@ -564,6 +564,13 @@ Definition core_clone_CloneI128 : core_clone_Clone i128 := {|
   clone := fun x => Ok (core_clone_impls_CloneI128_clone x)
 |}.
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+Definition core_option_Option_unwrap (T : Type) (x : option T) : result T :=
+  match x with
+  | None => Fail_ Failure
+  | Some x => Ok x
+  end.
+
 (*** core::ops *)
 
 (* Trait declaration: [core::ops::index::Index] *)
diff --git a/tests/fstar/arrays/Primitives.fst b/tests/fstar/arrays/Primitives.fst
index c7c9f9db..9951ccc3 100644
--- a/tests/fstar/arrays/Primitives.fst
+++ b/tests/fstar/arrays/Primitives.fst
@@ -540,6 +540,12 @@ let core_clone_CloneI128 : core_clone_Clone i128 = {
   clone = fun x -> Ok (core_clone_impls_CloneI128_clone x)
 }
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+let core_option_Option_unwrap (t : Type0) (x : option t) : result t =
+  match x with
+  | None -> Fail Failure
+  | Some x -> Ok x
+
 (*** core::ops *)
 
 // Trait declaration: [core::ops::index::Index]
diff --git a/tests/fstar/betree/BetreeMain.Clauses.Template.fst b/tests/fstar/betree/BetreeMain.Clauses.Template.fst
index de56ba46..b317dca4 100644
--- a/tests/fstar/betree/BetreeMain.Clauses.Template.fst
+++ b/tests/fstar/betree/BetreeMain.Clauses.Template.fst
@@ -45,7 +45,7 @@ let betree_Node_lookup_in_bindings_decreases (key : u64)
 unfold
 let betree_Node_apply_upserts_decreases
   (msgs : betree_List_t (u64 & betree_Message_t)) (prev : option u64)
-  (key : u64) (st : state) : nat =
+  (key : u64) : nat =
   admit ()
 
 (** [betree_main::betree::{betree_main::betree::Internal#4}::lookup_in_children]: decreases clause
diff --git a/tests/fstar/betree/BetreeMain.Clauses.fst b/tests/fstar/betree/BetreeMain.Clauses.fst
index ed5c5069..b95d4c7e 100644
--- a/tests/fstar/betree/BetreeMain.Clauses.fst
+++ b/tests/fstar/betree/BetreeMain.Clauses.fst
@@ -134,7 +134,7 @@ let betree_Node_lookup_first_message_for_key_decreases (key : u64)
 unfold
 let betree_Node_apply_upserts_decreases
   (msgs : betree_List_t (u64 & betree_Message_t)) (prev : option u64)
-  (key : u64) (st : state) : betree_List_t (u64 & betree_Message_t) =
+  (key : u64) : betree_List_t (u64 & betree_Message_t) =
   msgs
 
 (** [betree_main::betree::Internal::{4}::lookup_in_children]: decreases clause *)
diff --git a/tests/fstar/betree/BetreeMain.Funs.fst b/tests/fstar/betree/BetreeMain.Funs.fst
index 8e64f43f..89396df0 100644
--- a/tests/fstar/betree/BetreeMain.Funs.fst
+++ b/tests/fstar/betree/BetreeMain.Funs.fst
@@ -223,9 +223,9 @@ let rec betree_Node_lookup_in_bindings
     Source: 'src/betree.rs', lines 819:4-819:90 *)
 let rec betree_Node_apply_upserts
   (msgs : betree_List_t (u64 & betree_Message_t)) (prev : option u64)
-  (key : u64) (st : state) :
-  Tot (result (state & (u64 & (betree_List_t (u64 & betree_Message_t)))))
-  (decreases (betree_Node_apply_upserts_decreases msgs prev key st))
+  (key : u64) :
+  Tot (result (u64 & (betree_List_t (u64 & betree_Message_t))))
+  (decreases (betree_Node_apply_upserts_decreases msgs prev key))
   =
   let* b = betree_ListPairU64T_head_has_key betree_Message_t msgs key in
   if b
@@ -237,14 +237,14 @@ let rec betree_Node_apply_upserts
     | Betree_Message_Delete -> Fail Failure
     | Betree_Message_Upsert s ->
       let* v = betree_upsert_update prev s in
-      betree_Node_apply_upserts msgs1 (Some v) key st
+      betree_Node_apply_upserts msgs1 (Some v) key
     end
   else
-    let* (st1, v) = core_option_Option_unwrap u64 prev st in
+    let* v = core_option_Option_unwrap u64 prev in
     let* msgs1 =
       betree_List_push_front (u64 & betree_Message_t) msgs (key,
         Betree_Message_Insert v) in
-    Ok (st1, (v, msgs1))
+    Ok (v, msgs1)
 
 (** [betree_main::betree::{betree_main::betree::Internal#4}::lookup_in_children]:
     Source: 'src/betree.rs', lines 395:4-395:63 *)
@@ -298,12 +298,12 @@ and betree_Node_lookup
         | Betree_Message_Upsert ufs ->
           let* (st2, (v, node1)) =
             betree_Internal_lookup_in_children node key st1 in
-          let* (st3, (v1, pending1)) =
+          let* (v1, pending1) =
             betree_Node_apply_upserts (Betree_List_Cons (k,
-              Betree_Message_Upsert ufs) l) v key st2 in
+              Betree_Message_Upsert ufs) l) v key in
           let* msgs1 = lookup_first_message_for_key_back pending1 in
-          let* (st4, _) = betree_store_internal_node node1.id msgs1 st3 in
-          Ok (st4, (Some v1, Betree_Node_Internal node1))
+          let* (st3, _) = betree_store_internal_node node1.id msgs1 st2 in
+          Ok (st3, (Some v1, Betree_Node_Internal node1))
         end
     | Betree_List_Nil ->
       let* (st2, (o, node1)) = betree_Internal_lookup_in_children node key st1
diff --git a/tests/fstar/betree/Primitives.fst b/tests/fstar/betree/Primitives.fst
index c7c9f9db..9951ccc3 100644
--- a/tests/fstar/betree/Primitives.fst
+++ b/tests/fstar/betree/Primitives.fst
@@ -540,6 +540,12 @@ let core_clone_CloneI128 : core_clone_Clone i128 = {
   clone = fun x -> Ok (core_clone_impls_CloneI128_clone x)
 }
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+let core_option_Option_unwrap (t : Type0) (x : option t) : result t =
+  match x with
+  | None -> Fail Failure
+  | Some x -> Ok x
+
 (*** core::ops *)
 
 // Trait declaration: [core::ops::index::Index]
diff --git a/tests/fstar/betree_back_stateful/BetreeMain.Clauses.Template.fst b/tests/fstar/betree_back_stateful/BetreeMain.Clauses.Template.fst
index de56ba46..b317dca4 100644
--- a/tests/fstar/betree_back_stateful/BetreeMain.Clauses.Template.fst
+++ b/tests/fstar/betree_back_stateful/BetreeMain.Clauses.Template.fst
@@ -45,7 +45,7 @@ let betree_Node_lookup_in_bindings_decreases (key : u64)
 unfold
 let betree_Node_apply_upserts_decreases
   (msgs : betree_List_t (u64 & betree_Message_t)) (prev : option u64)
-  (key : u64) (st : state) : nat =
+  (key : u64) : nat =
   admit ()
 
 (** [betree_main::betree::{betree_main::betree::Internal#4}::lookup_in_children]: decreases clause
diff --git a/tests/fstar/betree_back_stateful/BetreeMain.Funs.fst b/tests/fstar/betree_back_stateful/BetreeMain.Funs.fst
index 8e64f43f..89396df0 100644
--- a/tests/fstar/betree_back_stateful/BetreeMain.Funs.fst
+++ b/tests/fstar/betree_back_stateful/BetreeMain.Funs.fst
@@ -223,9 +223,9 @@ let rec betree_Node_lookup_in_bindings
     Source: 'src/betree.rs', lines 819:4-819:90 *)
 let rec betree_Node_apply_upserts
   (msgs : betree_List_t (u64 & betree_Message_t)) (prev : option u64)
-  (key : u64) (st : state) :
-  Tot (result (state & (u64 & (betree_List_t (u64 & betree_Message_t)))))
-  (decreases (betree_Node_apply_upserts_decreases msgs prev key st))
+  (key : u64) :
+  Tot (result (u64 & (betree_List_t (u64 & betree_Message_t))))
+  (decreases (betree_Node_apply_upserts_decreases msgs prev key))
   =
   let* b = betree_ListPairU64T_head_has_key betree_Message_t msgs key in
   if b
@@ -237,14 +237,14 @@ let rec betree_Node_apply_upserts
     | Betree_Message_Delete -> Fail Failure
     | Betree_Message_Upsert s ->
       let* v = betree_upsert_update prev s in
-      betree_Node_apply_upserts msgs1 (Some v) key st
+      betree_Node_apply_upserts msgs1 (Some v) key
     end
   else
-    let* (st1, v) = core_option_Option_unwrap u64 prev st in
+    let* v = core_option_Option_unwrap u64 prev in
     let* msgs1 =
       betree_List_push_front (u64 & betree_Message_t) msgs (key,
         Betree_Message_Insert v) in
-    Ok (st1, (v, msgs1))
+    Ok (v, msgs1)
 
 (** [betree_main::betree::{betree_main::betree::Internal#4}::lookup_in_children]:
     Source: 'src/betree.rs', lines 395:4-395:63 *)
@@ -298,12 +298,12 @@ and betree_Node_lookup
         | Betree_Message_Upsert ufs ->
           let* (st2, (v, node1)) =
             betree_Internal_lookup_in_children node key st1 in
-          let* (st3, (v1, pending1)) =
+          let* (v1, pending1) =
             betree_Node_apply_upserts (Betree_List_Cons (k,
-              Betree_Message_Upsert ufs) l) v key st2 in
+              Betree_Message_Upsert ufs) l) v key in
           let* msgs1 = lookup_first_message_for_key_back pending1 in
-          let* (st4, _) = betree_store_internal_node node1.id msgs1 st3 in
-          Ok (st4, (Some v1, Betree_Node_Internal node1))
+          let* (st3, _) = betree_store_internal_node node1.id msgs1 st2 in
+          Ok (st3, (Some v1, Betree_Node_Internal node1))
         end
     | Betree_List_Nil ->
       let* (st2, (o, node1)) = betree_Internal_lookup_in_children node key st1
diff --git a/tests/fstar/betree_back_stateful/Primitives.fst b/tests/fstar/betree_back_stateful/Primitives.fst
index c7c9f9db..9951ccc3 100644
--- a/tests/fstar/betree_back_stateful/Primitives.fst
+++ b/tests/fstar/betree_back_stateful/Primitives.fst
@@ -540,6 +540,12 @@ let core_clone_CloneI128 : core_clone_Clone i128 = {
   clone = fun x -> Ok (core_clone_impls_CloneI128_clone x)
 }
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+let core_option_Option_unwrap (t : Type0) (x : option t) : result t =
+  match x with
+  | None -> Fail Failure
+  | Some x -> Ok x
+
 (*** core::ops *)
 
 // Trait declaration: [core::ops::index::Index]
diff --git a/tests/fstar/demo/Primitives.fst b/tests/fstar/demo/Primitives.fst
index c7c9f9db..9951ccc3 100644
--- a/tests/fstar/demo/Primitives.fst
+++ b/tests/fstar/demo/Primitives.fst
@@ -540,6 +540,12 @@ let core_clone_CloneI128 : core_clone_Clone i128 = {
   clone = fun x -> Ok (core_clone_impls_CloneI128_clone x)
 }
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+let core_option_Option_unwrap (t : Type0) (x : option t) : result t =
+  match x with
+  | None -> Fail Failure
+  | Some x -> Ok x
+
 (*** core::ops *)
 
 // Trait declaration: [core::ops::index::Index]
diff --git a/tests/fstar/hashmap/Primitives.fst b/tests/fstar/hashmap/Primitives.fst
index c7c9f9db..9951ccc3 100644
--- a/tests/fstar/hashmap/Primitives.fst
+++ b/tests/fstar/hashmap/Primitives.fst
@@ -540,6 +540,12 @@ let core_clone_CloneI128 : core_clone_Clone i128 = {
   clone = fun x -> Ok (core_clone_impls_CloneI128_clone x)
 }
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+let core_option_Option_unwrap (t : Type0) (x : option t) : result t =
+  match x with
+  | None -> Fail Failure
+  | Some x -> Ok x
+
 (*** core::ops *)
 
 // Trait declaration: [core::ops::index::Index]
diff --git a/tests/fstar/hashmap_on_disk/Primitives.fst b/tests/fstar/hashmap_on_disk/Primitives.fst
index c7c9f9db..9951ccc3 100644
--- a/tests/fstar/hashmap_on_disk/Primitives.fst
+++ b/tests/fstar/hashmap_on_disk/Primitives.fst
@@ -540,6 +540,12 @@ let core_clone_CloneI128 : core_clone_Clone i128 = {
   clone = fun x -> Ok (core_clone_impls_CloneI128_clone x)
 }
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+let core_option_Option_unwrap (t : Type0) (x : option t) : result t =
+  match x with
+  | None -> Fail Failure
+  | Some x -> Ok x
+
 (*** core::ops *)
 
 // Trait declaration: [core::ops::index::Index]
diff --git a/tests/fstar/misc/Primitives.fst b/tests/fstar/misc/Primitives.fst
index c7c9f9db..9951ccc3 100644
--- a/tests/fstar/misc/Primitives.fst
+++ b/tests/fstar/misc/Primitives.fst
@@ -540,6 +540,12 @@ let core_clone_CloneI128 : core_clone_Clone i128 = {
   clone = fun x -> Ok (core_clone_impls_CloneI128_clone x)
 }
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+let core_option_Option_unwrap (t : Type0) (x : option t) : result t =
+  match x with
+  | None -> Fail Failure
+  | Some x -> Ok x
+
 (*** core::ops *)
 
 // Trait declaration: [core::ops::index::Index]
diff --git a/tests/fstar/traits/Primitives.fst b/tests/fstar/traits/Primitives.fst
index c7c9f9db..9951ccc3 100644
--- a/tests/fstar/traits/Primitives.fst
+++ b/tests/fstar/traits/Primitives.fst
@@ -540,6 +540,12 @@ let core_clone_CloneI128 : core_clone_Clone i128 = {
   clone = fun x -> Ok (core_clone_impls_CloneI128_clone x)
 }
 
+(** [core::option::{core::option::Option<T>}::unwrap] *)
+let core_option_Option_unwrap (t : Type0) (x : option t) : result t =
+  match x with
+  | None -> Fail Failure
+  | Some x -> Ok x
+
 (*** core::ops *)
 
 // Trait declaration: [core::ops::index::Index]
diff --git a/tests/lean/BetreeMain/Funs.lean b/tests/lean/BetreeMain/Funs.lean
index 0c31b9bc..f0032d51 100644
--- a/tests/lean/BetreeMain/Funs.lean
+++ b/tests/lean/BetreeMain/Funs.lean
@@ -219,8 +219,8 @@ divergent def betree.Node.lookup_in_bindings
    Source: 'src/betree.rs', lines 819:4-819:90 -/
 divergent def betree.Node.apply_upserts
   (msgs : betree.List (U64 × betree.Message)) (prev : Option U64) (key : U64)
-  (st : State) :
-  Result (State × (U64 × (betree.List (U64 × betree.Message))))
+  :
+  Result (U64 × (betree.List (U64 × betree.Message)))
   :=
   do
   let b ← betree.ListPairU64T.head_has_key betree.Message msgs key
@@ -235,14 +235,14 @@ divergent def betree.Node.apply_upserts
     | betree.Message.Upsert s =>
       do
       let v ← betree.upsert_update prev s
-      betree.Node.apply_upserts msgs1 (some v) key st
+      betree.Node.apply_upserts msgs1 (some v) key
   else
     do
-    let (st1, v) ← core.option.Option.unwrap U64 prev st
+    let v ← core.option.Option.unwrap U64 prev
     let msgs1 ←
       betree.List.push_front (U64 × betree.Message) msgs (key,
         betree.Message.Insert v)
-    Result.ok (st1, (v, msgs1))
+    Result.ok (v, msgs1)
 
 /- [betree_main::betree::{betree_main::betree::Internal#4}::lookup_in_children]:
    Source: 'src/betree.rs', lines 395:4-395:63 -/
@@ -307,13 +307,13 @@ divergent def betree.Node.lookup
           let (st2, (v, node1)) ←
             betree.Internal.lookup_in_children (betree.Internal.mk i i1 n n1)
               key st1
-          let (st3, (v1, pending1)) ←
+          let (v1, pending1) ←
             betree.Node.apply_upserts (betree.List.Cons (k,
-              betree.Message.Upsert ufs) l) v key st2
+              betree.Message.Upsert ufs) l) v key
           let ⟨ i2, i3, n2, n3 ⟩ := node1
           let msgs1 ← lookup_first_message_for_key_back pending1
-          let (st4, _) ← betree.store_internal_node i2 msgs1 st3
-          Result.ok (st4, (some v1, betree.Node.Internal (betree.Internal.mk i2
+          let (st3, _) ← betree.store_internal_node i2 msgs1 st2
+          Result.ok (st3, (some v1, betree.Node.Internal (betree.Internal.mk i2
             i3 n2 n3)))
     | betree.List.Nil =>
       do