Johnni Winther
77fcb33bd0
Closes #42721 Change-Id: Ia962c8ff3b6d469a0884b8983994de5c5c2286f4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155760 Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
43 lines
1.2 KiB
Dart
43 lines
1.2 KiB
Dart
// Copyright (c) 2020, 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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import 'dart:async';
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typedef G<T> = dynamic Function<S extends T>(S);
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typedef H<T> = dynamic Function<S extends FutureOr<T>>(S, FutureOr<T>);
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// TODO(johnniwinther): Enable and use these when #41951 is fixed to test that
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// updating self referencing type parameters works.
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//typedef I<T> = void Function<S extends FutureOr<S>>(S, T);
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//typedef J<T> = void Function<S extends FutureOr<S>?>(S, T);
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//typedef K<T> = void Function<S extends FutureOr<S?>>(S, T);
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class C<T> {
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G<T> field1;
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H<T> field2;
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C(this.field1, this.field2);
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}
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test1(C<num> c) {
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var f1 = c.field1 = <S extends num>(S s) {
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return s + 1; // ok
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};
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var f2 = c.field2 = <S extends FutureOr<num>>(S s, FutureOr<num> t) async {
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return (await t) + 1; // ok
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};
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}
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test2(C<num?> c) {
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var f1 = c.field1 = <S extends num?>(S s) {
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return s + 1; // error
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};
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var f2 = c.field2 = <S extends FutureOr<num?>>(S s, FutureOr<num?> t) async {
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return (await t) + 1; // error
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};
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}
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test3<S extends num?>(S s) => s + 1; // error
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main() {}
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