Joshua Litt
eab26cd2bd
Change-Id: Ia1f913a01f2be006158967b145db3ee34b297cfe Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155660 Commit-Queue: Joshua Litt <joshualitt@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
56 lines
1.4 KiB
Dart
56 lines
1.4 KiB
Dart
// Copyright (c) 2018, 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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// @dart = 2.7
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import 'dart:async';
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import 'package:expect/expect.dart';
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/*class: global#Future:checkedInstance*/
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/*class: A:checks=[],instance*/
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class A<T> {
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@pragma('dart2js:noInline')
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m(o) => o is FutureOr<T>;
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}
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/*class: B:checkedInstance,checks=[],instance,typeArgument*/
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class B {}
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// TODO(johnniwinther): Do we need the implied `checkedTypeArgument` from
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// the `Future<C>` test in `A.m`?
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/*class: C:checkedInstance,typeArgument*/
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class C {}
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/*class: FutureMock:checks=[$isFuture],instance*/
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class FutureMock<T> implements Future<T> {
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final T value;
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FutureMock(this.value);
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@override
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Future<T> timeout(Duration timeLimit, {FutureOr<T> onTimeout()}) => null;
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@override
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Stream<T> asStream() => null;
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@override
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Future<T> whenComplete(FutureOr action()) => null;
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@override
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Future<T> catchError(Function onError, {bool test(bool test(Object error))}) {
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return null;
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}
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@override
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Future<S> then<S>(FutureOr<S> onValue(T value), {Function onError}) => null;
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}
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main() {
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Expect.isTrue(new A<B>().m(new B()));
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Expect.isTrue(new A<B>().m(new FutureMock<B>(new B())));
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Expect.isFalse(new A<C>().m(new B()));
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Expect.isFalse(new A<C>().m(new FutureMock<B>(new B())));
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}
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