Robert Nystrom
d52fe19dee
Even when a switch case only contains a constant (and not some more complex pattern), Dart 3.0 changes the semantics and allows constants of types that don't have primitive equality. Add some tests for that. Change-Id: Id3578d017822695451d7e44590fa349a8191a310 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/287663 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Erik Ernst <eernst@google.com>
47 lines
1.2 KiB
Dart
47 lines
1.2 KiB
Dart
// Copyright (c) 2023, 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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// SharedOptions=--enable-experiment=patterns,records
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// Switch cases may call user-defined `==` methods, which can have arbitrary
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// side effects. Test that the cases are tried in order.
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import "package:expect/expect.dart";
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class SideEffect {
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static final effects = <String>[];
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static String test(int value) {
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effects.clear();
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switch (SideEffect(value)) {
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case const SideEffect(1):
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effects.add('match one');
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case const SideEffect(2):
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effects.add('match two');
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default:
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effects.add('no match');
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}
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return effects.join(', ');
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}
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final int value;
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const SideEffect(this.value);
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String toString() => 'S($value)';
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bool operator ==(Object other) {
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effects.add('$this == $other');
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return other is SideEffect && value == other.value;
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}
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}
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main() {
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Expect.equals('S(1) == S(1), match one', SideEffect.test(1));
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Expect.equals('S(1) == S(2), S(2) == S(2), match two', SideEffect.test(2));
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Expect.equals('S(1) == S(3), S(2) == S(3), no match', SideEffect.test(3));
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}
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