(** THIS FILE WAS AUTOMATICALLY GENERATED BY AENEAS *)
(** [external]: function definitions *)
Require Import Primitives.
Import Primitives.
Require Import Coq.ZArith.ZArith.
Require Import List.
Import ListNotations.
Local Open Scope Primitives_scope.
Require Import External_Types.
Include External_Types.
Require Import External_FunsExternal.
Include External_FunsExternal.
Module External_Funs.

(** [external::swap]: forward function
    Source: 'src/external.rs', lines 6:0-6:46 *)
Definition swap
  (T : Type) (x : T) (y : T) (st : state) : result (state * unit) :=
  p <- core_mem_swap 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]: backward function 0
    Source: 'src/external.rs', lines 6:0-6:46 *)
Definition swap_back
  (T : Type) (x : T) (y : T) (st : state) (st0 : state) :
  result (state * (T * T))
  :=
  p <- core_mem_swap 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]: forward function
    Source: 'src/external.rs', lines 11:0-11:60 *)
Definition test_new_non_zero_u32
  (x : u32) (st : state) : result (state * core_num_nonzero_NonZeroU32_t) :=
  p <- core_num_nonzero_NonZeroU32_new x st;
  let (st0, o) := p in
  core_option_Option_unwrap core_num_nonzero_NonZeroU32_t o st0
.

(** [external::test_vec]: forward function
    Source: 'src/external.rs', lines 17:0-17:17 *)
Definition test_vec : result unit :=
  let v := alloc_vec_Vec_new u32 in
  _ <- alloc_vec_Vec_push u32 v 0%u32;
  Return tt
.

(** Unit test for [external::test_vec] *)
Check (test_vec )%return.

(** [external::custom_swap]: forward function
    Source: 'src/external.rs', lines 24:0-24:66 *)
Definition custom_swap
  (T : Type) (x : T) (y : T) (st : state) : result (state * T) :=
  p <- core_mem_swap 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]: backward function 0
    Source: 'src/external.rs', lines 24:0-24:66 *)
Definition custom_swap_back
  (T : Type) (x : T) (y : T) (st : state) (ret : T) (st0 : state) :
  result (state * (T * T))
  :=
  p <- core_mem_swap 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]: forward function
    Source: 'src/external.rs', lines 29:0-29:59 *)
Definition test_custom_swap
  (x : u32) (y : u32) (st : state) : result (state * unit) :=
  p <- custom_swap u32 x y st; let (st0, _) := p in Return (st0, tt)
.

(** [external::test_custom_swap]: backward function 0
    Source: 'src/external.rs', lines 29:0-29:59 *)
Definition test_custom_swap_back
  (x : u32) (y : u32) (st : state) (st0 : state) :
  result (state * (u32 * u32))
  :=
  custom_swap_back u32 x y st 1%u32 st0
.

(** [external::test_swap_non_zero]: forward function
    Source: 'src/external.rs', lines 35:0-35:44 *)
Definition test_swap_non_zero (x : u32) (st : state) : result (state * u32) :=
  p <- swap 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.