// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// @dart = 2.9

import 'dart:async';

void vv = null;
dynamic vd = null;
Object vo = null;
Null vn = null;
int vi = null;
Future<void> fvv = null;
Future<dynamic> fvd = null;
Future<Object> fvo = null;
Future<Null> fvn = null;
Future<int> fvi = null;
FutureOr<void> fovv = null;
FutureOr<dynamic> fovd = null;
FutureOr<Object> fovo = null;
FutureOr<Null> fovn = null;
FutureOr<int> fovi = null;

/* Test the cases where expression bodied functions are more permissive
 * than block bodied functions (places where they behave the same
 * are tested below).

An asynchronous expression bodied function with return type `T` and return
expression `e` has a valid return if:
  * `flatten(T)` is `void`
  * or `return e;` is a valid return for an equivalent block bodied function
  with return type `T` as defined below.
*/

void async_int_to_void_e() async => vi;
Future<void> async_int_to_Future_void__e() async => vi;
FutureOr<void> async_int_to_FutureOr_void__e() async => vi;
void async_Object_to_void_e() async => vo;
Future<void> async_Object_to_Future_void__e() async => vo;
FutureOr<void> async_Object_to_FutureOr_void__e() async => vo;
void async_Future_int__to_void_e() async => fvi;
Future<void> async_Future_int__to_Future_void__e() async => fvi;
FutureOr<void> async_Future_int__to_FutureOr_void__e() async => fvi;
void async_FutureOr_int__to_void_e() async => fovi;
Future<void> async_FutureOr_int__to_Future_void__e() async => fovi;
FutureOr<void> async_FutureOr_int__to_FutureOr_void__e() async => fovi;
void async_Future_Object__to_void_e() async => fvo;
Future<void> async_Future_Object__to_Future_void__e() async => fvo;
FutureOr<void> async_Future_Object__to_FutureOr_void__e() async => fvo;
void async_FutureOr_Object__to_void_e() async => fovo;
Future<void> async_FutureOr_Object__to_Future_void__e() async => fovo;
FutureOr<void> async_FutureOr_Object__to_FutureOr_void__e() async => fovo;

/* Test the cases that apply only to block bodied  functions
 */

/*
* `return;` is a valid return if any of the following are true:
  * `flatten(T)` is `void`
  * `flatten(T)` is `dynamic`
  * `flatten(T)` is `Null`.
*/
Future<void> async_empty_to_Future_void_() async {
  return;
}

Future<dynamic> async_empty_to_Future_dynamic_() async {
  return;
}

Future<Null> async_empty_to_Future_Null_() async {
  return;
}

FutureOr<void> async_empty_to_FutureOr_void_() async {
  return;
}

FutureOr<dynamic> async_empty_to_FutureOr_dynamic_() async {
  return;
}

FutureOr<Null> async_empty_to_FutureOr_Null_() async {
  return;
}

void async_empty_to_void() async {
  return;
}

dynamic async_empty_to_dynamic() async {
  return;
}

/* Test the cases that apply to both expression bodied and block bodied
 * functions
 */

/*
* `return exp;` where `exp` has static type `S` is a valid return if:
  * `flatten(S)` is `void`
  * and `flatten(T)` is `void`, `dynamic` or `Null`
*/
Future<void> async_void_to_Future_void__e() async => vv;
Future<void> async_void_to_Future_void_() async {
  return vv;
}

Future<void> async_Future_void__to_Future_void__e() async => fvv;
Future<void> async_Future_void__to_Future_void_() async {
  return fvv;
}

Future<void> async_FutureOr_void__to_Future_void__e() async => fovv;
Future<void> async_FutureOr_void__to_Future_void_() async {
  return fovv;
}

Future<dynamic> async_void_to_Future_dynamic__e() async => vv;
Future<dynamic> async_void_to_Future_dynamic_() async {
  return vv;
}

Future<dynamic> async_Future_void__to_Future_dynamic__e() async => fvv;
Future<dynamic> async_Future_void__to_Future_dynamic_() async {
  return fvv;
}

Future<dynamic> async_FutureOr_void__to_Future_dynamic__e() async => fovv;
Future<dynamic> async_FutureOr_void__to_Future_dynamic_() async {
  return fovv;
}

Future<Null> async_void_to_Future_Null__e() async => vv;
Future<Null> async_void_to_Future_Null_() async {
  return vv;
}

Future<Null> async_Future_void__to_Future_Null__e() async => fvv;
Future<Null> async_Future_void__to_Future_Null_() async {
  return fvv;
}

Future<Null> async_FutureOr_void__to_Future_Null__e() async => fovv;
Future<Null> async_FutureOr_void__to_Future_Null_() async {
  return fovv;
}

FutureOr<void> async_void_to_FutureOr_void__e() async => vv;
FutureOr<void> async_void_to_FutureOr_void_() async {
  return vv;
}

FutureOr<void> async_Future_void__to_FutureOr_void__e() async => fvv;
FutureOr<void> async_Future_void__to_FutureOr_void_() async {
  return fvv;
}

FutureOr<void> async_FutureOr_void__to_FutureOr_void__e() async => fovv;
FutureOr<void> async_FutureOr_void__to_FutureOr_void_() async {
  return fovv;
}

FutureOr<dynamic> async_void_to_FutureOr_dynamic__e() async => vv;
FutureOr<dynamic> async_void_to_FutureOr_dynamic_() async {
  return vv;
}

FutureOr<dynamic> async_Future_void__to_FutureOr_dynamic__e() async => fvv;
FutureOr<dynamic> async_Future_void__to_FutureOr_dynamic_() async {
  return fvv;
}

FutureOr<dynamic> async_FutureOr_void__to_FutureOr_dynamic__e() async => fovv;
FutureOr<dynamic> async_FutureOr_void__to_FutureOr_dynamic_() async {
  return fovv;
}

FutureOr<Null> async_void_to_FutureOr_Null__e() async => vv;
FutureOr<Null> async_void_to_FutureOr_Null_() async {
  return vv;
}

FutureOr<Null> async_Future_void__to_FutureOr_Null__e() async => fvv;
FutureOr<Null> async_Future_void__to_FutureOr_Null_() async {
  return fvv;
}

FutureOr<Null> async_FutureOr_void__to_FutureOr_Null__e() async => fovv;
FutureOr<Null> async_FutureOr_void__to_FutureOr_Null_() async {
  return fovv;
}

void async_void_to_void_e() async => vv;
void async_void_to_void() async {
  return vv;
}

void async_Future_void__to_void_e() async => fvv;
void async_Future_void__to_void() async {
  return fvv;
}

void async_FutureOr_void__to_void_e() async => fovv;
void async_FutureOr_void__to_void() async {
  return fovv;
}

dynamic async_void_to_dynamic_e() async => vv;
dynamic async_void_to_dynamic() async {
  return vv;
}

dynamic async_Future_void__to_dynamic_e() async => fvv;
dynamic async_Future_void__to_dynamic() async {
  return fvv;
}

dynamic async_FutureOr_void__to_dynamic_e() async => fovv;
dynamic async_FutureOr_void__to_dynamic() async {
  return fovv;
}

/*
* `return exp;` where `exp` has static type `S` is a valid return if:
  * `flatten(T)` is `void`
  * and `flatten(S)` is `void`, `dynamic` or `Null`
*/
void async_Future_dynamic__to_void_e() async => fvd;
void async_Future_dynamic__to_void() async {
  return fvd;
}

Future<void> async_Future_dynamic__to_Future_void__e() async => fvd;
Future<void> async_Future_dynamic__to_Future_void_() async {
  return fvd;
}

FutureOr<void> async_Future_dynamic__to_FutureOr_void__e() async => fvd;
FutureOr<void> async_Future_dynamic__to_FutureOr_void_() async {
  return fvd;
}

void async_Future_Null__to_void_e() async => fvn;
void async_Future_Null__to_void() async {
  return fvn;
}

Future<void> async_Future_Null__to_Future_void__e() async => fvn;
Future<void> async_Future_Null__to_Future_void_() async {
  return fvn;
}

FutureOr<void> async_Future_Null__to_FutureOr_void__e() async => fvn;
FutureOr<void> async_Future_Null__to_FutureOr_void_() async {
  return fvn;
}

void async_FutureOr_dynamic__to_void_e() async => fovd;
void async_FutureOr_dynamic__to_void() async {
  return fovd;
}

Future<void> async_FutureOr_dynamic__to_Future_void__e() async => fovd;
Future<void> async_FutureOr_dynamic__to_Future_void_() async {
  return fovd;
}

FutureOr<void> async_FutureOr_dynamic__to_FutureOr_void__e() async => fovd;
FutureOr<void> async_FutureOr_dynamic__to_FutureOr_void_() async {
  return fovd;
}

void async_FutureOr_Null__to_void_e() async => fovn;
void async_FutureOr_Null__to_void() async {
  return fovn;
}

Future<void> async_FutureOr_Null__to_Future_void__e() async => fovn;
Future<void> async_FutureOr_Null__to_Future_void_() async {
  return fovn;
}

FutureOr<void> async_FutureOr_Null__to_FutureOr_void__e() async => fovn;
FutureOr<void> async_FutureOr_Null__to_FutureOr_void_() async {
  return fovn;
}

void async_dynamic_to_void_e() async => vd;
void async_dynamic_to_void() async {
  return vd;
}

Future<void> async_dynamic_to_Future_void__e() async => vd;
Future<void> async_dynamic_to_Future_void_() async {
  return vd;
}

FutureOr<void> async_dynamic_to_FutureOr_void__e() async => vd;
FutureOr<void> async_dynamic_to_FutureOr_void_() async {
  return vd;
}

void async_Null_to_void_e() async => vn;
void async_Null_to_void() async {
  return vn;
}

Future<void> async_Null_to_Future_void__e() async => vn;
Future<void> async_Null_to_Future_void_() async {
  return vn;
}

FutureOr<void> async_Null_to_FutureOr_void__e() async => vn;
FutureOr<void> async_Null_to_FutureOr_void_() async {
  return vn;
}

/*
* `return exp;` where `exp` has static type `S` is a valid return if:
  * `T` is not `void`
  * and `flatten(S)` is not `void`
  * and `Future<flatten(S)>` is assignable to `T`
*/
Future<int> async_int_to_Future_int__e() async => vi;
Future<int> async_int_to_Future_int_() async {
  return vi;
}

Future<int> async_Object_to_Future_int__e() async => vo;
Future<int> async_Object_to_Future_int_() async {
  return vo;
}

Future<int> async_FutureOr_int__to_Future_int__e() async => fovi;
Future<int> async_FutureOr_int__to_Future_int_() async {
  return fovi;
}

Future<int> async_Future_int__to_Future_int__e() async => fvi;
Future<int> async_Future_int__to_Future_int_() async {
  return fvi;
}

Future<void> async_int_to_Future_void_() async {
  return vi;
}

Future<void> async_Object_to_Future_void_() async {
  return vo;
}

Future<void> async_FutureOr_int__to_Future_void_() async {
  return fovi;
}

Future<void> async_Future_int__to_Future_void_() async {
  return fvi;
}

FutureOr<void> async_int_to_FutureOr_void_() async {
  return vi;
}

FutureOr<void> async_Object_to_FutureOr_void_() async {
  return vo;
}

FutureOr<void> async_FutureOr_int__to_FutureOr_void_() async {
  return fovi;
}

FutureOr<void> async_Future_int__to_FutureOr_void_() async {
  return fvi;
}

void main() {
  async_int_to_void_e();
  async_int_to_Future_void__e();
  async_int_to_FutureOr_void__e();
  async_Object_to_void_e();
  async_Object_to_Future_void__e();
  async_Object_to_FutureOr_void__e();
  async_Future_int__to_void_e();
  async_Future_int__to_Future_void__e();
  async_Future_int__to_FutureOr_void__e();
  async_FutureOr_int__to_void_e();
  async_FutureOr_int__to_Future_void__e();
  async_FutureOr_int__to_FutureOr_void__e();
  async_Future_Object__to_void_e();
  async_Future_Object__to_Future_void__e();
  async_Future_Object__to_FutureOr_void__e();
  async_FutureOr_Object__to_void_e();
  async_FutureOr_Object__to_Future_void__e();
  async_FutureOr_Object__to_FutureOr_void__e();
  async_empty_to_Future_void_();
  async_empty_to_Future_dynamic_();
  async_empty_to_Future_Null_();
  async_empty_to_FutureOr_void_();
  async_empty_to_FutureOr_dynamic_();
  async_empty_to_FutureOr_Null_();
  async_empty_to_void();
  async_empty_to_dynamic();
  async_void_to_Future_void__e();
  async_void_to_Future_void_();
  async_Future_void__to_Future_void__e();
  async_Future_void__to_Future_void_();
  async_FutureOr_void__to_Future_void__e();
  async_FutureOr_void__to_Future_void_();
  async_void_to_Future_dynamic__e();
  async_void_to_Future_dynamic_();
  async_Future_void__to_Future_dynamic__e();
  async_Future_void__to_Future_dynamic_();
  async_FutureOr_void__to_Future_dynamic__e();
  async_FutureOr_void__to_Future_dynamic_();
  async_void_to_Future_Null__e();
  async_void_to_Future_Null_();
  async_Future_void__to_Future_Null__e();
  async_Future_void__to_Future_Null_();
  async_FutureOr_void__to_Future_Null__e();
  async_FutureOr_void__to_Future_Null_();
  async_void_to_FutureOr_void__e();
  async_void_to_FutureOr_void_();
  async_Future_void__to_FutureOr_void__e();
  async_Future_void__to_FutureOr_void_();
  async_FutureOr_void__to_FutureOr_void__e();
  async_FutureOr_void__to_FutureOr_void_();
  async_void_to_FutureOr_dynamic__e();
  async_void_to_FutureOr_dynamic_();
  async_Future_void__to_FutureOr_dynamic__e();
  async_Future_void__to_FutureOr_dynamic_();
  async_FutureOr_void__to_FutureOr_dynamic__e();
  async_FutureOr_void__to_FutureOr_dynamic_();
  async_void_to_FutureOr_Null__e();
  async_void_to_FutureOr_Null_();
  async_Future_void__to_FutureOr_Null__e();
  async_Future_void__to_FutureOr_Null_();
  async_FutureOr_void__to_FutureOr_Null__e();
  async_FutureOr_void__to_FutureOr_Null_();
  async_void_to_void_e();
  async_void_to_void();
  async_Future_void__to_void_e();
  async_Future_void__to_void();
  async_FutureOr_void__to_void_e();
  async_FutureOr_void__to_void();
  async_void_to_dynamic_e();
  async_void_to_dynamic();
  async_Future_void__to_dynamic_e();
  async_Future_void__to_dynamic();
  async_FutureOr_void__to_dynamic_e();
  async_FutureOr_void__to_dynamic();
  async_Future_dynamic__to_void_e();
  async_Future_dynamic__to_void();
  async_Future_dynamic__to_Future_void__e();
  async_Future_dynamic__to_Future_void_();
  async_Future_dynamic__to_FutureOr_void__e();
  async_Future_dynamic__to_FutureOr_void_();
  async_Future_Null__to_void_e();
  async_Future_Null__to_void();
  async_Future_Null__to_Future_void__e();
  async_Future_Null__to_Future_void_();
  async_Future_Null__to_FutureOr_void__e();
  async_Future_Null__to_FutureOr_void_();
  async_FutureOr_dynamic__to_void_e();
  async_FutureOr_dynamic__to_void();
  async_FutureOr_dynamic__to_Future_void__e();
  async_FutureOr_dynamic__to_Future_void_();
  async_FutureOr_dynamic__to_FutureOr_void__e();
  async_FutureOr_dynamic__to_FutureOr_void_();
  async_FutureOr_Null__to_void_e();
  async_FutureOr_Null__to_void();
  async_FutureOr_Null__to_Future_void__e();
  async_FutureOr_Null__to_Future_void_();
  async_FutureOr_Null__to_FutureOr_void__e();
  async_FutureOr_Null__to_FutureOr_void_();
  async_dynamic_to_void_e();
  async_dynamic_to_void();
  async_dynamic_to_Future_void__e();
  async_dynamic_to_Future_void_();
  async_dynamic_to_FutureOr_void__e();
  async_dynamic_to_FutureOr_void_();
  async_Null_to_void_e();
  async_Null_to_void();
  async_Null_to_Future_void__e();
  async_Null_to_Future_void_();
  async_Null_to_FutureOr_void__e();
  async_Null_to_FutureOr_void_();
  async_int_to_Future_int__e();
  async_int_to_Future_int_();
  async_Object_to_Future_int__e();
  async_Object_to_Future_int_();
  async_FutureOr_int__to_Future_int__e();
  async_FutureOr_int__to_Future_int_();
  async_Future_int__to_Future_int__e();
  async_Future_int__to_Future_int_();
  async_int_to_Future_void__e();
  async_int_to_Future_void_();
  async_Object_to_Future_void__e();
  async_Object_to_Future_void_();
  async_FutureOr_int__to_Future_void__e();
  async_FutureOr_int__to_Future_void_();
  async_Future_int__to_Future_void__e();
  async_Future_int__to_Future_void_();
  async_int_to_FutureOr_void__e();
  async_int_to_FutureOr_void_();
  async_Object_to_FutureOr_void__e();
  async_Object_to_FutureOr_void_();
  async_FutureOr_int__to_FutureOr_void__e();
  async_FutureOr_int__to_FutureOr_void_();
  async_Future_int__to_FutureOr_void__e();
  async_Future_int__to_FutureOr_void_();
}