blob: ec496a0e1b578a8167f36e052699b4d618522ee8 [file] [log] [blame]
// 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();
}