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a2b556b937
Change-Id: Ia5c41dda6503e1fbb8cc6099835d07588425e2ba Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128310 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
47 lines
1.2 KiB
Dart
47 lines
1.2 KiB
Dart
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library stream_controller_async_test;
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import 'dart:async';
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import 'package:expect/expect.dart';
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import 'package:async_helper/async_helper.dart';
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class A {
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const A();
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}
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class B extends A {
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const B();
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}
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class C extends B {
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const C();
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}
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main() {
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asyncStart();
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{
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Stream<B> stream = new Stream<B>.fromIterable([new B()]);
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A aFunc() => const A();
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// Make sure that firstWhere does not allow you to return instances
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// of types that are not subtypes of the generic type of the stream.
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stream.firstWhere((x) => false, //# badType: compile-time error
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orElse: aFunc); // //# badType: continued
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}
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{
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asyncStart();
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C cFunc() => const C();
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Stream<B> stream = new Stream<B>.fromIterable([new B()]);
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// Make sure that firstWhere does allow you to return instances
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// of types that are subtypes of the generic type of the stream.
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stream.firstWhere((x) => false, orElse: cFunc).then((value) {
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Expect.identical(const C(), value);
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asyncEnd();
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});
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}
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asyncEnd();
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}
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