dart-sdk/tests/lib_2/async/stream_first_where_test.dart
Leaf Petersen b101a7d002 Add language versions to _2 test libraries
Change-Id: Ib33169c3e0ffc870915c189404074a1dea472546
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196548
Reviewed-by: Bob Nystrom <rnystrom@google.com>
Commit-Queue: Leaf Petersen <leafp@google.com>
2021-04-26 17:58:57 +00:00

49 lines
1.2 KiB
Dart

// Copyright (c) 2011, 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
library stream_controller_async_test;
import 'dart:async';
import 'package:expect/expect.dart';
import 'package:async_helper/async_helper.dart';
class A {
const A();
}
class B extends A {
const B();
}
class C extends B {
const C();
}
main() {
asyncStart();
{
Stream<B> stream = new Stream<B>.fromIterable([new B()]);
A aFunc() => const A();
// Make sure that firstWhere does not allow you to return instances
// of types that are not subtypes of the generic type of the stream.
stream.firstWhere((x) => false, //# badType: compile-time error
orElse: aFunc); // //# badType: continued
}
{
asyncStart();
C cFunc() => const C();
Stream<B> stream = new Stream<B>.fromIterable([new B()]);
// Make sure that firstWhere does allow you to return instances
// of types that are subtypes of the generic type of the stream.
stream.firstWhere((x) => false, orElse: cFunc).then((value) {
Expect.identical(const C(), value);
asyncEnd();
});
}
asyncEnd();
}