| // Copyright (c) 2016, 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 |
| |
| /// @assertion If f is marked async*, then a fresh instance s implementing |
| /// the built-in class Stream is associated with the invocation and |
| /// immediately returned. When s is listened to, execution of the body of f will |
| /// begin. When f terminates: |
| /// • If the current return value is defined then, if s has been canceled |
| /// then its cancellation future is completed with null. |
| /// • If the current exception x is defined: |
| /// – x is added to s. |
| /// – If s has been canceled then its cancellation future is completed with |
| /// x as an error. |
| /// • s is closed. |
| /// |
| /// @description Check that a fresh instance of Stream is returned to the |
| /// caller of async generator. |
| /// |
| /// @author a.semenov@unipro.ru |
| |
| import 'dart:async'; |
| import '../../../Utils/expect.dart'; |
| |
| Stream test() async* { |
| yield 1; |
| } |
| |
| main() { |
| Set history = new Set.identity(); |
| for (var i = 0; i < 10; i++) { |
| Stream s = test(); |
| Expect.isFalse(history.contains(s)); |
| history.add(s); |
| } |
| } |