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48608ce9bc
Change-Id: I8e21f82dc241a63f78fb1f6a25669b1aa633788c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152080 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Leaf Petersen <leafp@google.com>
53 lines
1.6 KiB
Dart
53 lines
1.6 KiB
Dart
// Copyright (c) 2019, 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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// Tests reified types of torn-off methods with type parameters that have
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// explicit variance modifiers.
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// SharedOptions=--enable-experiment=variance
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import "package:expect/expect.dart";
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class Contravariant<in T> {
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int method(T x) { return -1; }
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}
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class Invariant<inout T> {
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T method(T x) { return x; }
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}
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class LegacyCovariant<T> {
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int method(T x) { return -1; }
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}
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class NoSuchMethod<inout T> implements Invariant<T> {
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noSuchMethod(_) => 3;
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}
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main() {
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Contravariant<int> contraDiff = new Contravariant<num>();
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Expect.notType<int Function(Object)>(contraDiff.method);
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Expect.type<int Function(num)>(contraDiff.method);
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Contravariant<num> contraSame = new Contravariant<num>();
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Expect.notType<int Function(Object)>(contraSame.method);
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Expect.type<int Function(num)>(contraSame.method);
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Invariant<num> invSame = new Invariant<num>();
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Expect.notType<num Function(Object)>(invSame.method);
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Expect.type<num Function(num)>(invSame.method);
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LegacyCovariant<num> legacyDiff = new LegacyCovariant<int>();
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Expect.type<int Function(Object)>(legacyDiff.method);
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Expect.type<int Function(num)>(legacyDiff.method);
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LegacyCovariant<num> legacySame = new LegacyCovariant<num>();
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Expect.type<int Function(Object)>(legacySame.method);
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Expect.type<int Function(num)>(legacySame.method);
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NoSuchMethod<num> nsm = new NoSuchMethod<num>();
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Expect.notType<num Function(Object)>(nsm.method);
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Expect.type<num Function(num)>(nsm.method);
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}
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