mirror of
https://github.com/dart-lang/sdk
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05ca544f15
Change-Id: Iaa0ca2b4f2d1b15f79ddca37834d3ed2497bc068 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149242 Commit-Queue: Joshua Litt <joshualitt@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
52 lines
1.2 KiB
Dart
52 lines
1.2 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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class SuperClass {
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const SuperClass();
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bool operator ==(Object other);
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}
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class Class extends SuperClass {
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const Class();
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bool operator ==(Object other);
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}
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class SubClass extends Class {
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const SubClass();
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bool operator ==(Object other) => false;
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}
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main() {
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// This test verifies that when overriding `==` it is a compile time error to
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// use that class as a key in a switch, but only if the override provides a
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// body. However, with NNBD, all of these switches became compile time errors
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// so now we cast `null` as `dynamic` to get these first two switches past
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// the compiler.
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switch (null as dynamic) {
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case const SuperClass():
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break;
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default:
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}
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switch (null as dynamic) {
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case const Class():
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break;
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default:
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}
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switch (null as dynamic) {
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case const SubClass(): //# 01: compile-time error
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break; //# 01: continued
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default:
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}
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switch (null) {
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case null:
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break;
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default:
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}
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}
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