Johnni Winther
0fde98290e
Change-Id: I97392718faf380d1431e76e808bbe775e25e3d4e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/177860 Reviewed-by: Dmitry Stefantsov <dmitryas@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>
24 lines
611 B
Dart
24 lines
611 B
Dart
// Copyright (c) 2021, 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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T id<T>(T value) => value;
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main() async {
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FutureOr<int> x = 1 + id(1);
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FutureOr<int> y = 1 + id(1)
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..checkStaticType<Exactly<int>>();
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FutureOr<int> z = 1 + contextType(1)
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..checkStaticType<Exactly<int>>();
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}
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extension<T> on T {
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void checkStaticType<R extends Exactly<T>>() {}
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}
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typedef Exactly<T> = T Function(T);
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T contextType<T>(Object? o) => o as T;
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