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diff --git a/tests/coq/misc/External_Funs.v b/tests/coq/misc/External_Funs.v
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+(** THIS FILE WAS AUTOMATICALLY GENERATED BY AENEAS *)
+(** [external]: function definitions *)
+Require Import Primitives.
+Import Primitives.
+Require Import Coq.ZArith.ZArith.
+Local Open Scope Primitives_scope.
+Require Export External_Types.
+Import External_Types.
+Require Export External_Opaque.
+Import External_Opaque.
+Module External_Funs.
+
+(** [external::swap] *)
+Definition swap_fwd
+  (T : Type) (x : T) (y : T) (st : state) : result (state * unit) :=
+  p <- core_mem_swap_fwd T x y st;
+  let (st0, _) := p in
+  p0 <- core_mem_swap_back0 T x y st st0;
+  let (st1, _) := p0 in
+  p1 <- core_mem_swap_back1 T x y st st1;
+  let (st2, _) := p1 in
+  Return (st2, tt)
+.
+
+(** [external::swap] *)
+Definition swap_back
+  (T : Type) (x : T) (y : T) (st : state) (st0 : state) :
+  result (state * (T * T))
+  :=
+  p <- core_mem_swap_fwd T x y st;
+  let (st1, _) := p in
+  p0 <- core_mem_swap_back0 T x y st st1;
+  let (st2, x0) := p0 in
+  p1 <- core_mem_swap_back1 T x y st st2;
+  let (_, y0) := p1 in
+  Return (st0, (x0, y0))
+.
+
+(** [external::test_new_non_zero_u32] *)
+Definition test_new_non_zero_u32_fwd
+  (x : u32) (st : state) : result (state * Core_num_nonzero_non_zero_u32_t) :=
+  p <- core_num_nonzero_non_zero_u32_new_fwd x st;
+  let (st0, opt) := p in
+  p0 <- core_option_option_unwrap_fwd Core_num_nonzero_non_zero_u32_t opt st0;
+  let (st1, nzu) := p0 in
+  Return (st1, nzu)
+.
+
+(** [external::test_vec] *)
+Definition test_vec_fwd : result unit :=
+  let v := vec_new u32 in
+  v0 <- vec_push_back u32 v (0%u32);
+  let _ := v0 in
+  Return tt
+.
+
+(** Unit test for [external::test_vec] *)
+Check (test_vec_fwd )%return.
+
+(** [external::custom_swap] *)
+Definition custom_swap_fwd
+  (T : Type) (x : T) (y : T) (st : state) : result (state * T) :=
+  p <- core_mem_swap_fwd T x y st;
+  let (st0, _) := p in
+  p0 <- core_mem_swap_back0 T x y st st0;
+  let (st1, x0) := p0 in
+  p1 <- core_mem_swap_back1 T x y st st1;
+  let (st2, _) := p1 in
+  Return (st2, x0)
+.
+
+(** [external::custom_swap] *)
+Definition custom_swap_back
+  (T : Type) (x : T) (y : T) (st : state) (ret : T) (st0 : state) :
+  result (state * (T * T))
+  :=
+  p <- core_mem_swap_fwd T x y st;
+  let (st1, _) := p in
+  p0 <- core_mem_swap_back0 T x y st st1;
+  let (st2, _) := p0 in
+  p1 <- core_mem_swap_back1 T x y st st2;
+  let (_, y0) := p1 in
+  Return (st0, (ret, y0))
+.
+
+(** [external::test_custom_swap] *)
+Definition test_custom_swap_fwd
+  (x : u32) (y : u32) (st : state) : result (state * unit) :=
+  p <- custom_swap_fwd u32 x y st; let (st0, _) := p in Return (st0, tt)
+.
+
+(** [external::test_custom_swap] *)
+Definition test_custom_swap_back
+  (x : u32) (y : u32) (st : state) (st0 : state) :
+  result (state * (u32 * u32))
+  :=
+  p <- custom_swap_back u32 x y st (1%u32) st0;
+  let (st1, p0) := p in
+  let (x0, y0) := p0 in
+  Return (st1, (x0, y0))
+.
+
+(** [external::test_swap_non_zero] *)
+Definition test_swap_non_zero_fwd
+  (x : u32) (st : state) : result (state * u32) :=
+  p <- swap_fwd u32 x (0%u32) st;
+  let (st0, _) := p in
+  p0 <- swap_back u32 x (0%u32) st st0;
+  let (st1, p1) := p0 in
+  let (x0, _) := p1 in
+  if x0 s= 0%u32 then Fail_ Failure else Return (st1, x0)
+.
+
+End External_Funs .