Merge pull request #65 from AeneasVerif/son/fix_loops

Fix an issue with loops

4 files changed, 103 insertions, 72 deletions

diff --git a/tests/fstar-split/misc/Loops.Clauses.Template.fst b/tests/fstar-split/misc/Loops.Clauses.Template.fst
index 6be351c6..244761d3 100644
--- a/tests/fstar-split/misc/Loops.Clauses.Template.fst
+++ b/tests/fstar-split/misc/Loops.Clauses.Template.fst
@@ -24,106 +24,113 @@ let sum_with_shared_borrows_loop_decreases (max : u32) (i : u32) (s : u32) :
   nat =
   admit ()
 
+(** [loops::sum_array]: decreases clause
+    Source: 'src/loops.rs', lines 50:0-58:1 *)
+unfold
+let sum_array_loop_decreases (n : usize) (a : array u32 n) (i : usize)
+  (s : u32) : nat =
+  admit ()
+
 (** [loops::clear]: decreases clause
-    Source: 'src/loops.rs', lines 52:0-58:1 *)
+    Source: 'src/loops.rs', lines 62:0-68:1 *)
 unfold
 let clear_loop_decreases (v : alloc_vec_Vec u32) (i : usize) : nat = admit ()
 
 (** [loops::list_mem]: decreases clause
-    Source: 'src/loops.rs', lines 66:0-75:1 *)
+    Source: 'src/loops.rs', lines 76:0-85:1 *)
 unfold let list_mem_loop_decreases (x : u32) (ls : list_t u32) : nat = admit ()
 
 (** [loops::list_nth_mut_loop]: decreases clause
-    Source: 'src/loops.rs', lines 78:0-88:1 *)
+    Source: 'src/loops.rs', lines 88:0-98:1 *)
 unfold
 let list_nth_mut_loop_loop_decreases (t : Type0) (ls : list_t t) (i : u32) :
   nat =
   admit ()
 
 (** [loops::list_nth_shared_loop]: decreases clause
-    Source: 'src/loops.rs', lines 91:0-101:1 *)
+    Source: 'src/loops.rs', lines 101:0-111:1 *)
 unfold
 let list_nth_shared_loop_loop_decreases (t : Type0) (ls : list_t t) (i : u32) :
   nat =
   admit ()
 
 (** [loops::get_elem_mut]: decreases clause
-    Source: 'src/loops.rs', lines 103:0-117:1 *)
+    Source: 'src/loops.rs', lines 113:0-127:1 *)
 unfold
 let get_elem_mut_loop_decreases (x : usize) (ls : list_t usize) : nat =
   admit ()
 
 (** [loops::get_elem_shared]: decreases clause
-    Source: 'src/loops.rs', lines 119:0-133:1 *)
+    Source: 'src/loops.rs', lines 129:0-143:1 *)
 unfold
 let get_elem_shared_loop_decreases (x : usize) (ls : list_t usize) : nat =
   admit ()
 
 (** [loops::list_nth_mut_loop_with_id]: decreases clause
-    Source: 'src/loops.rs', lines 144:0-155:1 *)
+    Source: 'src/loops.rs', lines 154:0-165:1 *)
 unfold
 let list_nth_mut_loop_with_id_loop_decreases (t : Type0) (i : u32)
   (ls : list_t t) : nat =
   admit ()
 
 (** [loops::list_nth_shared_loop_with_id]: decreases clause
-    Source: 'src/loops.rs', lines 158:0-169:1 *)
+    Source: 'src/loops.rs', lines 168:0-179:1 *)
 unfold
 let list_nth_shared_loop_with_id_loop_decreases (t : Type0) (i : u32)
   (ls : list_t t) : nat =
   admit ()
 
 (** [loops::list_nth_mut_loop_pair]: decreases clause
-    Source: 'src/loops.rs', lines 174:0-195:1 *)
+    Source: 'src/loops.rs', lines 184:0-205:1 *)
 unfold
 let list_nth_mut_loop_pair_loop_decreases (t : Type0) (ls0 : list_t t)
   (ls1 : list_t t) (i : u32) : nat =
   admit ()
 
 (** [loops::list_nth_shared_loop_pair]: decreases clause
-    Source: 'src/loops.rs', lines 198:0-219:1 *)
+    Source: 'src/loops.rs', lines 208:0-229:1 *)
 unfold
 let list_nth_shared_loop_pair_loop_decreases (t : Type0) (ls0 : list_t t)
   (ls1 : list_t t) (i : u32) : nat =
   admit ()
 
 (** [loops::list_nth_mut_loop_pair_merge]: decreases clause
-    Source: 'src/loops.rs', lines 223:0-238:1 *)
+    Source: 'src/loops.rs', lines 233:0-248:1 *)
 unfold
 let list_nth_mut_loop_pair_merge_loop_decreases (t : Type0) (ls0 : list_t t)
   (ls1 : list_t t) (i : u32) : nat =
   admit ()
 
 (** [loops::list_nth_shared_loop_pair_merge]: decreases clause
-    Source: 'src/loops.rs', lines 241:0-256:1 *)
+    Source: 'src/loops.rs', lines 251:0-266:1 *)
 unfold
 let list_nth_shared_loop_pair_merge_loop_decreases (t : Type0) (ls0 : list_t t)
   (ls1 : list_t t) (i : u32) : nat =
   admit ()
 
 (** [loops::list_nth_mut_shared_loop_pair]: decreases clause
-    Source: 'src/loops.rs', lines 259:0-274:1 *)
+    Source: 'src/loops.rs', lines 269:0-284:1 *)
 unfold
 let list_nth_mut_shared_loop_pair_loop_decreases (t : Type0) (ls0 : list_t t)
   (ls1 : list_t t) (i : u32) : nat =
   admit ()
 
 (** [loops::list_nth_mut_shared_loop_pair_merge]: decreases clause
-    Source: 'src/loops.rs', lines 278:0-293:1 *)
+    Source: 'src/loops.rs', lines 288:0-303:1 *)
 unfold
 let list_nth_mut_shared_loop_pair_merge_loop_decreases (t : Type0)
   (ls0 : list_t t) (ls1 : list_t t) (i : u32) : nat =
   admit ()
 
 (** [loops::list_nth_shared_mut_loop_pair]: decreases clause
-    Source: 'src/loops.rs', lines 297:0-312:1 *)
+    Source: 'src/loops.rs', lines 307:0-322:1 *)
 unfold
 let list_nth_shared_mut_loop_pair_loop_decreases (t : Type0) (ls0 : list_t t)
   (ls1 : list_t t) (i : u32) : nat =
   admit ()
 
 (** [loops::list_nth_shared_mut_loop_pair_merge]: decreases clause
-    Source: 'src/loops.rs', lines 316:0-331:1 *)
+    Source: 'src/loops.rs', lines 326:0-341:1 *)
 unfold
 let list_nth_shared_mut_loop_pair_merge_loop_decreases (t : Type0)
   (ls0 : list_t t) (ls1 : list_t t) (i : u32) : nat =
diff --git a/tests/fstar-split/misc/Loops.Clauses.fst b/tests/fstar-split/misc/Loops.Clauses.fst
index 75194437..13f5513d 100644
--- a/tests/fstar-split/misc/Loops.Clauses.fst
+++ b/tests/fstar-split/misc/Loops.Clauses.fst
@@ -19,6 +19,11 @@ unfold
 let sum_with_shared_borrows_loop_decreases (max : u32) (i : u32) (s : u32) : nat =
   if max >= i then max - i else 0
 
+(** [loops::sum_array]: decreases clause *)
+unfold
+let sum_array_loop_decreases (n : usize) (_ : array u32 n) (i : usize) (_ : u32) : nat =
+  if n >= i then n - i else 0
+
 (** [loops::clear]: decreases clause *)
 unfold let clear_loop_decreases (v : alloc_vec_Vec u32) (i : usize) : nat =
   if i <= List.Tot.length v then List.Tot.length v - i else 0
diff --git a/tests/fstar-split/misc/Loops.Funs.fst b/tests/fstar-split/misc/Loops.Funs.fst
index 3168fddb..01d66726 100644
--- a/tests/fstar-split/misc/Loops.Funs.fst
+++ b/tests/fstar-split/misc/Loops.Funs.fst
@@ -58,9 +58,28 @@ let rec sum_with_shared_borrows_loop
 let sum_with_shared_borrows (max : u32) : result u32 =
   sum_with_shared_borrows_loop max 0 0
 
+(** [loops::sum_array]: loop 0: forward function
+    Source: 'src/loops.rs', lines 50:0-58:1 *)
+let rec sum_array_loop
+  (n : usize) (a : array u32 n) (i : usize) (s : u32) :
+  Tot (result u32) (decreases (sum_array_loop_decreases n a i s))
+  =
+  if i < n
+  then
+    let* i1 = array_index_usize u32 n a i in
+    let* s1 = u32_add s i1 in
+    let* i2 = usize_add i 1 in
+    sum_array_loop n a i2 s1
+  else Return s
+
+(** [loops::sum_array]: forward function
+    Source: 'src/loops.rs', lines 50:0-50:52 *)
+let sum_array (n : usize) (a : array u32 n) : result u32 =
+  sum_array_loop n a 0 0
+
 (** [loops::clear]: loop 0: merged forward/backward function
     (there is a single backward function, and the forward function returns ())
-    Source: 'src/loops.rs', lines 52:0-58:1 *)
+    Source: 'src/loops.rs', lines 62:0-68:1 *)
 let rec clear_loop
   (v : alloc_vec_Vec u32) (i : usize) :
   Tot (result (alloc_vec_Vec u32)) (decreases (clear_loop_decreases v i))
@@ -77,12 +96,12 @@ let rec clear_loop
 
 (** [loops::clear]: merged forward/backward function
     (there is a single backward function, and the forward function returns ())
-    Source: 'src/loops.rs', lines 52:0-52:30 *)
+    Source: 'src/loops.rs', lines 62:0-62:30 *)
 let clear (v : alloc_vec_Vec u32) : result (alloc_vec_Vec u32) =
   clear_loop v 0
 
 (** [loops::list_mem]: loop 0: forward function
-    Source: 'src/loops.rs', lines 66:0-75:1 *)
+    Source: 'src/loops.rs', lines 76:0-85:1 *)
 let rec list_mem_loop
   (x : u32) (ls : list_t u32) :
   Tot (result bool) (decreases (list_mem_loop_decreases x ls))
@@ -93,12 +112,12 @@ let rec list_mem_loop
   end
 
 (** [loops::list_mem]: forward function
-    Source: 'src/loops.rs', lines 66:0-66:52 *)
+    Source: 'src/loops.rs', lines 76:0-76:52 *)
 let list_mem (x : u32) (ls : list_t u32) : result bool =
   list_mem_loop x ls
 
 (** [loops::list_nth_mut_loop]: loop 0: forward function
-    Source: 'src/loops.rs', lines 78:0-88:1 *)
+    Source: 'src/loops.rs', lines 88:0-98:1 *)
 let rec list_nth_mut_loop_loop
   (t : Type0) (ls : list_t t) (i : u32) :
   Tot (result t) (decreases (list_nth_mut_loop_loop_decreases t ls i))
@@ -112,12 +131,12 @@ let rec list_nth_mut_loop_loop
   end
 
 (** [loops::list_nth_mut_loop]: forward function
-    Source: 'src/loops.rs', lines 78:0-78:71 *)
+    Source: 'src/loops.rs', lines 88:0-88:71 *)
 let list_nth_mut_loop (t : Type0) (ls : list_t t) (i : u32) : result t =
   list_nth_mut_loop_loop t ls i
 
 (** [loops::list_nth_mut_loop]: loop 0: backward function 0
-    Source: 'src/loops.rs', lines 78:0-88:1 *)
+    Source: 'src/loops.rs', lines 88:0-98:1 *)
 let rec list_nth_mut_loop_loop_back
   (t : Type0) (ls : list_t t) (i : u32) (ret : t) :
   Tot (result (list_t t)) (decreases (list_nth_mut_loop_loop_decreases t ls i))
@@ -134,13 +153,13 @@ let rec list_nth_mut_loop_loop_back
   end
 
 (** [loops::list_nth_mut_loop]: backward function 0
-    Source: 'src/loops.rs', lines 78:0-78:71 *)
+    Source: 'src/loops.rs', lines 88:0-88:71 *)
 let list_nth_mut_loop_back
   (t : Type0) (ls : list_t t) (i : u32) (ret : t) : result (list_t t) =
   list_nth_mut_loop_loop_back t ls i ret
 
 (** [loops::list_nth_shared_loop]: loop 0: forward function
-    Source: 'src/loops.rs', lines 91:0-101:1 *)
+    Source: 'src/loops.rs', lines 101:0-111:1 *)
 let rec list_nth_shared_loop_loop
   (t : Type0) (ls : list_t t) (i : u32) :
   Tot (result t) (decreases (list_nth_shared_loop_loop_decreases t ls i))
@@ -154,12 +173,12 @@ let rec list_nth_shared_loop_loop
   end
 
 (** [loops::list_nth_shared_loop]: forward function
-    Source: 'src/loops.rs', lines 91:0-91:66 *)
+    Source: 'src/loops.rs', lines 101:0-101:66 *)
 let list_nth_shared_loop (t : Type0) (ls : list_t t) (i : u32) : result t =
   list_nth_shared_loop_loop t ls i
 
 (** [loops::get_elem_mut]: loop 0: forward function
-    Source: 'src/loops.rs', lines 103:0-117:1 *)
+    Source: 'src/loops.rs', lines 113:0-127:1 *)
 let rec get_elem_mut_loop
   (x : usize) (ls : list_t usize) :
   Tot (result usize) (decreases (get_elem_mut_loop_decreases x ls))
@@ -170,7 +189,7 @@ let rec get_elem_mut_loop
   end
 
 (** [loops::get_elem_mut]: forward function
-    Source: 'src/loops.rs', lines 103:0-103:73 *)
+    Source: 'src/loops.rs', lines 113:0-113:73 *)
 let get_elem_mut
   (slots : alloc_vec_Vec (list_t usize)) (x : usize) : result usize =
   let* l =
@@ -179,7 +198,7 @@ let get_elem_mut
   get_elem_mut_loop x l
 
 (** [loops::get_elem_mut]: loop 0: backward function 0
-    Source: 'src/loops.rs', lines 103:0-117:1 *)
+    Source: 'src/loops.rs', lines 113:0-127:1 *)
 let rec get_elem_mut_loop_back
   (x : usize) (ls : list_t usize) (ret : usize) :
   Tot (result (list_t usize)) (decreases (get_elem_mut_loop_decreases x ls))
@@ -193,7 +212,7 @@ let rec get_elem_mut_loop_back
   end
 
 (** [loops::get_elem_mut]: backward function 0
-    Source: 'src/loops.rs', lines 103:0-103:73 *)
+    Source: 'src/loops.rs', lines 113:0-113:73 *)
 let get_elem_mut_back
   (slots : alloc_vec_Vec (list_t usize)) (x : usize) (ret : usize) :
   result (alloc_vec_Vec (list_t usize))
@@ -206,7 +225,7 @@ let get_elem_mut_back
     (core_slice_index_SliceIndexUsizeSliceTInst (list_t usize)) slots 0 l1
 
 (** [loops::get_elem_shared]: loop 0: forward function
-    Source: 'src/loops.rs', lines 119:0-133:1 *)
+    Source: 'src/loops.rs', lines 129:0-143:1 *)
 let rec get_elem_shared_loop
   (x : usize) (ls : list_t usize) :
   Tot (result usize) (decreases (get_elem_shared_loop_decreases x ls))
@@ -217,7 +236,7 @@ let rec get_elem_shared_loop
   end
 
 (** [loops::get_elem_shared]: forward function
-    Source: 'src/loops.rs', lines 119:0-119:68 *)
+    Source: 'src/loops.rs', lines 129:0-129:68 *)
 let get_elem_shared
   (slots : alloc_vec_Vec (list_t usize)) (x : usize) : result usize =
   let* l =
@@ -226,23 +245,23 @@ let get_elem_shared
   get_elem_shared_loop x l
 
 (** [loops::id_mut]: forward function
-    Source: 'src/loops.rs', lines 135:0-135:50 *)
+    Source: 'src/loops.rs', lines 145:0-145:50 *)
 let id_mut (t : Type0) (ls : list_t t) : result (list_t t) =
   Return ls
 
 (** [loops::id_mut]: backward function 0
-    Source: 'src/loops.rs', lines 135:0-135:50 *)
+    Source: 'src/loops.rs', lines 145:0-145:50 *)
 let id_mut_back
   (t : Type0) (ls : list_t t) (ret : list_t t) : result (list_t t) =
   Return ret
 
 (** [loops::id_shared]: forward function
-    Source: 'src/loops.rs', lines 139:0-139:45 *)
+    Source: 'src/loops.rs', lines 149:0-149:45 *)
 let id_shared (t : Type0) (ls : list_t t) : result (list_t t) =
   Return ls
 
 (** [loops::list_nth_mut_loop_with_id]: loop 0: forward function
-    Source: 'src/loops.rs', lines 144:0-155:1 *)
+    Source: 'src/loops.rs', lines 154:0-165:1 *)
 let rec list_nth_mut_loop_with_id_loop
   (t : Type0) (i : u32) (ls : list_t t) :
   Tot (result t) (decreases (list_nth_mut_loop_with_id_loop_decreases t i ls))
@@ -256,13 +275,13 @@ let rec list_nth_mut_loop_with_id_loop
   end
 
 (** [loops::list_nth_mut_loop_with_id]: forward function
-    Source: 'src/loops.rs', lines 144:0-144:75 *)
+    Source: 'src/loops.rs', lines 154:0-154:75 *)
 let list_nth_mut_loop_with_id
   (t : Type0) (ls : list_t t) (i : u32) : result t =
   let* ls1 = id_mut t ls in list_nth_mut_loop_with_id_loop t i ls1
 
 (** [loops::list_nth_mut_loop_with_id]: loop 0: backward function 0
-    Source: 'src/loops.rs', lines 144:0-155:1 *)
+    Source: 'src/loops.rs', lines 154:0-165:1 *)
 let rec list_nth_mut_loop_with_id_loop_back
   (t : Type0) (i : u32) (ls : list_t t) (ret : t) :
   Tot (result (list_t t))
@@ -280,7 +299,7 @@ let rec list_nth_mut_loop_with_id_loop_back
   end
 
 (** [loops::list_nth_mut_loop_with_id]: backward function 0
-    Source: 'src/loops.rs', lines 144:0-144:75 *)
+    Source: 'src/loops.rs', lines 154:0-154:75 *)
 let list_nth_mut_loop_with_id_back
   (t : Type0) (ls : list_t t) (i : u32) (ret : t) : result (list_t t) =
   let* ls1 = id_mut t ls in
@@ -288,7 +307,7 @@ let list_nth_mut_loop_with_id_back
   id_mut_back t ls l
 
 (** [loops::list_nth_shared_loop_with_id]: loop 0: forward function
-    Source: 'src/loops.rs', lines 158:0-169:1 *)
+    Source: 'src/loops.rs', lines 168:0-179:1 *)
 let rec list_nth_shared_loop_with_id_loop
   (t : Type0) (i : u32) (ls : list_t t) :
   Tot (result t)
@@ -303,13 +322,13 @@ let rec list_nth_shared_loop_with_id_loop
   end
 
 (** [loops::list_nth_shared_loop_with_id]: forward function
-    Source: 'src/loops.rs', lines 158:0-158:70 *)
+    Source: 'src/loops.rs', lines 168:0-168:70 *)
 let list_nth_shared_loop_with_id
   (t : Type0) (ls : list_t t) (i : u32) : result t =
   let* ls1 = id_shared t ls in list_nth_shared_loop_with_id_loop t i ls1
 
 (** [loops::list_nth_mut_loop_pair]: loop 0: forward function
-    Source: 'src/loops.rs', lines 174:0-195:1 *)
+    Source: 'src/loops.rs', lines 184:0-205:1 *)
 let rec list_nth_mut_loop_pair_loop
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) :
   Tot (result (t & t))
@@ -328,13 +347,13 @@ let rec list_nth_mut_loop_pair_loop
   end
 
 (** [loops::list_nth_mut_loop_pair]: forward function
-    Source: 'src/loops.rs', lines 174:0-178:27 *)
+    Source: 'src/loops.rs', lines 184:0-188:27 *)
 let list_nth_mut_loop_pair
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) : result (t & t) =
   list_nth_mut_loop_pair_loop t ls0 ls1 i
 
 (** [loops::list_nth_mut_loop_pair]: loop 0: backward function 0
-    Source: 'src/loops.rs', lines 174:0-195:1 *)
+    Source: 'src/loops.rs', lines 184:0-205:1 *)
 let rec list_nth_mut_loop_pair_loop_back'a
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   Tot (result (list_t t))
@@ -356,7 +375,7 @@ let rec list_nth_mut_loop_pair_loop_back'a
   end
 
 (** [loops::list_nth_mut_loop_pair]: backward function 0
-    Source: 'src/loops.rs', lines 174:0-178:27 *)
+    Source: 'src/loops.rs', lines 184:0-188:27 *)
 let list_nth_mut_loop_pair_back'a
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   result (list_t t)
@@ -364,7 +383,7 @@ let list_nth_mut_loop_pair_back'a
   list_nth_mut_loop_pair_loop_back'a t ls0 ls1 i ret
 
 (** [loops::list_nth_mut_loop_pair]: loop 0: backward function 1
-    Source: 'src/loops.rs', lines 174:0-195:1 *)
+    Source: 'src/loops.rs', lines 184:0-205:1 *)
 let rec list_nth_mut_loop_pair_loop_back'b
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   Tot (result (list_t t))
@@ -386,7 +405,7 @@ let rec list_nth_mut_loop_pair_loop_back'b
   end
 
 (** [loops::list_nth_mut_loop_pair]: backward function 1
-    Source: 'src/loops.rs', lines 174:0-178:27 *)
+    Source: 'src/loops.rs', lines 184:0-188:27 *)
 let list_nth_mut_loop_pair_back'b
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   result (list_t t)
@@ -394,7 +413,7 @@ let list_nth_mut_loop_pair_back'b
   list_nth_mut_loop_pair_loop_back'b t ls0 ls1 i ret
 
 (** [loops::list_nth_shared_loop_pair]: loop 0: forward function
-    Source: 'src/loops.rs', lines 198:0-219:1 *)
+    Source: 'src/loops.rs', lines 208:0-229:1 *)
 let rec list_nth_shared_loop_pair_loop
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) :
   Tot (result (t & t))
@@ -413,13 +432,13 @@ let rec list_nth_shared_loop_pair_loop
   end
 
 (** [loops::list_nth_shared_loop_pair]: forward function
-    Source: 'src/loops.rs', lines 198:0-202:19 *)
+    Source: 'src/loops.rs', lines 208:0-212:19 *)
 let list_nth_shared_loop_pair
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) : result (t & t) =
   list_nth_shared_loop_pair_loop t ls0 ls1 i
 
 (** [loops::list_nth_mut_loop_pair_merge]: loop 0: forward function
-    Source: 'src/loops.rs', lines 223:0-238:1 *)
+    Source: 'src/loops.rs', lines 233:0-248:1 *)
 let rec list_nth_mut_loop_pair_merge_loop
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) :
   Tot (result (t & t))
@@ -439,13 +458,13 @@ let rec list_nth_mut_loop_pair_merge_loop
   end
 
 (** [loops::list_nth_mut_loop_pair_merge]: forward function
-    Source: 'src/loops.rs', lines 223:0-227:27 *)
+    Source: 'src/loops.rs', lines 233:0-237:27 *)
 let list_nth_mut_loop_pair_merge
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) : result (t & t) =
   list_nth_mut_loop_pair_merge_loop t ls0 ls1 i
 
 (** [loops::list_nth_mut_loop_pair_merge]: loop 0: backward function 0
-    Source: 'src/loops.rs', lines 223:0-238:1 *)
+    Source: 'src/loops.rs', lines 233:0-248:1 *)
 let rec list_nth_mut_loop_pair_merge_loop_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : (t & t)) :
   Tot (result ((list_t t) & (list_t t)))
@@ -468,7 +487,7 @@ let rec list_nth_mut_loop_pair_merge_loop_back
   end
 
 (** [loops::list_nth_mut_loop_pair_merge]: backward function 0
-    Source: 'src/loops.rs', lines 223:0-227:27 *)
+    Source: 'src/loops.rs', lines 233:0-237:27 *)
 let list_nth_mut_loop_pair_merge_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : (t & t)) :
   result ((list_t t) & (list_t t))
@@ -476,7 +495,7 @@ let list_nth_mut_loop_pair_merge_back
   list_nth_mut_loop_pair_merge_loop_back t ls0 ls1 i ret
 
 (** [loops::list_nth_shared_loop_pair_merge]: loop 0: forward function
-    Source: 'src/loops.rs', lines 241:0-256:1 *)
+    Source: 'src/loops.rs', lines 251:0-266:1 *)
 let rec list_nth_shared_loop_pair_merge_loop
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) :
   Tot (result (t & t))
@@ -497,13 +516,13 @@ let rec list_nth_shared_loop_pair_merge_loop
   end
 
 (** [loops::list_nth_shared_loop_pair_merge]: forward function
-    Source: 'src/loops.rs', lines 241:0-245:19 *)
+    Source: 'src/loops.rs', lines 251:0-255:19 *)
 let list_nth_shared_loop_pair_merge
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) : result (t & t) =
   list_nth_shared_loop_pair_merge_loop t ls0 ls1 i
 
 (** [loops::list_nth_mut_shared_loop_pair]: loop 0: forward function
-    Source: 'src/loops.rs', lines 259:0-274:1 *)
+    Source: 'src/loops.rs', lines 269:0-284:1 *)
 let rec list_nth_mut_shared_loop_pair_loop
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) :
   Tot (result (t & t))
@@ -524,13 +543,13 @@ let rec list_nth_mut_shared_loop_pair_loop
   end
 
 (** [loops::list_nth_mut_shared_loop_pair]: forward function
-    Source: 'src/loops.rs', lines 259:0-263:23 *)
+    Source: 'src/loops.rs', lines 269:0-273:23 *)
 let list_nth_mut_shared_loop_pair
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) : result (t & t) =
   list_nth_mut_shared_loop_pair_loop t ls0 ls1 i
 
 (** [loops::list_nth_mut_shared_loop_pair]: loop 0: backward function 0
-    Source: 'src/loops.rs', lines 259:0-274:1 *)
+    Source: 'src/loops.rs', lines 269:0-284:1 *)
 let rec list_nth_mut_shared_loop_pair_loop_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   Tot (result (list_t t))
@@ -552,7 +571,7 @@ let rec list_nth_mut_shared_loop_pair_loop_back
   end
 
 (** [loops::list_nth_mut_shared_loop_pair]: backward function 0
-    Source: 'src/loops.rs', lines 259:0-263:23 *)
+    Source: 'src/loops.rs', lines 269:0-273:23 *)
 let list_nth_mut_shared_loop_pair_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   result (list_t t)
@@ -560,7 +579,7 @@ let list_nth_mut_shared_loop_pair_back
   list_nth_mut_shared_loop_pair_loop_back t ls0 ls1 i ret
 
 (** [loops::list_nth_mut_shared_loop_pair_merge]: loop 0: forward function
-    Source: 'src/loops.rs', lines 278:0-293:1 *)
+    Source: 'src/loops.rs', lines 288:0-303:1 *)
 let rec list_nth_mut_shared_loop_pair_merge_loop
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) :
   Tot (result (t & t))
@@ -581,13 +600,13 @@ let rec list_nth_mut_shared_loop_pair_merge_loop
   end
 
 (** [loops::list_nth_mut_shared_loop_pair_merge]: forward function
-    Source: 'src/loops.rs', lines 278:0-282:23 *)
+    Source: 'src/loops.rs', lines 288:0-292:23 *)
 let list_nth_mut_shared_loop_pair_merge
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) : result (t & t) =
   list_nth_mut_shared_loop_pair_merge_loop t ls0 ls1 i
 
 (** [loops::list_nth_mut_shared_loop_pair_merge]: loop 0: backward function 0
-    Source: 'src/loops.rs', lines 278:0-293:1 *)
+    Source: 'src/loops.rs', lines 288:0-303:1 *)
 let rec list_nth_mut_shared_loop_pair_merge_loop_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   Tot (result (list_t t))
@@ -610,7 +629,7 @@ let rec list_nth_mut_shared_loop_pair_merge_loop_back
   end
 
 (** [loops::list_nth_mut_shared_loop_pair_merge]: backward function 0
-    Source: 'src/loops.rs', lines 278:0-282:23 *)
+    Source: 'src/loops.rs', lines 288:0-292:23 *)
 let list_nth_mut_shared_loop_pair_merge_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   result (list_t t)
@@ -618,7 +637,7 @@ let list_nth_mut_shared_loop_pair_merge_back
   list_nth_mut_shared_loop_pair_merge_loop_back t ls0 ls1 i ret
 
 (** [loops::list_nth_shared_mut_loop_pair]: loop 0: forward function
-    Source: 'src/loops.rs', lines 297:0-312:1 *)
+    Source: 'src/loops.rs', lines 307:0-322:1 *)
 let rec list_nth_shared_mut_loop_pair_loop
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) :
   Tot (result (t & t))
@@ -639,13 +658,13 @@ let rec list_nth_shared_mut_loop_pair_loop
   end
 
 (** [loops::list_nth_shared_mut_loop_pair]: forward function
-    Source: 'src/loops.rs', lines 297:0-301:23 *)
+    Source: 'src/loops.rs', lines 307:0-311:23 *)
 let list_nth_shared_mut_loop_pair
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) : result (t & t) =
   list_nth_shared_mut_loop_pair_loop t ls0 ls1 i
 
 (** [loops::list_nth_shared_mut_loop_pair]: loop 0: backward function 1
-    Source: 'src/loops.rs', lines 297:0-312:1 *)
+    Source: 'src/loops.rs', lines 307:0-322:1 *)
 let rec list_nth_shared_mut_loop_pair_loop_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   Tot (result (list_t t))
@@ -667,7 +686,7 @@ let rec list_nth_shared_mut_loop_pair_loop_back
   end
 
 (** [loops::list_nth_shared_mut_loop_pair]: backward function 1
-    Source: 'src/loops.rs', lines 297:0-301:23 *)
+    Source: 'src/loops.rs', lines 307:0-311:23 *)
 let list_nth_shared_mut_loop_pair_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   result (list_t t)
@@ -675,7 +694,7 @@ let list_nth_shared_mut_loop_pair_back
   list_nth_shared_mut_loop_pair_loop_back t ls0 ls1 i ret
 
 (** [loops::list_nth_shared_mut_loop_pair_merge]: loop 0: forward function
-    Source: 'src/loops.rs', lines 316:0-331:1 *)
+    Source: 'src/loops.rs', lines 326:0-341:1 *)
 let rec list_nth_shared_mut_loop_pair_merge_loop
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) :
   Tot (result (t & t))
@@ -696,13 +715,13 @@ let rec list_nth_shared_mut_loop_pair_merge_loop
   end
 
 (** [loops::list_nth_shared_mut_loop_pair_merge]: forward function
-    Source: 'src/loops.rs', lines 316:0-320:23 *)
+    Source: 'src/loops.rs', lines 326:0-330:23 *)
 let list_nth_shared_mut_loop_pair_merge
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) : result (t & t) =
   list_nth_shared_mut_loop_pair_merge_loop t ls0 ls1 i
 
 (** [loops::list_nth_shared_mut_loop_pair_merge]: loop 0: backward function 0
-    Source: 'src/loops.rs', lines 316:0-331:1 *)
+    Source: 'src/loops.rs', lines 326:0-341:1 *)
 let rec list_nth_shared_mut_loop_pair_merge_loop_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   Tot (result (list_t t))
@@ -725,7 +744,7 @@ let rec list_nth_shared_mut_loop_pair_merge_loop_back
   end
 
 (** [loops::list_nth_shared_mut_loop_pair_merge]: backward function 0
-    Source: 'src/loops.rs', lines 316:0-320:23 *)
+    Source: 'src/loops.rs', lines 326:0-330:23 *)
 let list_nth_shared_mut_loop_pair_merge_back
   (t : Type0) (ls0 : list_t t) (ls1 : list_t t) (i : u32) (ret : t) :
   result (list_t t)
diff --git a/tests/fstar-split/misc/Loops.Types.fst b/tests/fstar-split/misc/Loops.Types.fst
index 8aa38290..29f56e1b 100644
--- a/tests/fstar-split/misc/Loops.Types.fst
+++ b/tests/fstar-split/misc/Loops.Types.fst
@@ -6,7 +6,7 @@ open Primitives
 #set-options "--z3rlimit 50 --fuel 1 --ifuel 1"
 
 (** [loops::List]
-    Source: 'src/loops.rs', lines 60:0-60:16 *)
+    Source: 'src/loops.rs', lines 70:0-70:16 *)
 type list_t (t : Type0) =
 | List_Cons : t -> list_t t -> list_t t
 | List_Nil : list_t t