| /* |
| * Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| * for details. All rights reserved. Use of this source code is governed by a |
| * BSD-style license that can be found in the LICENSE file. |
| */ |
| /** |
| * @assertion Evaluation of an equality expression ee of the form super == e |
| * proceeds as follows: |
| * • The expression e is evaluated to an object o. |
| * • If either this or o is null, then ee evaluates to evaluates to true if both |
| * this and o are null and to false otherwise. Otherwise ee is equivalent to |
| * the method invocation super.==(o). |
| * @description Checks that if nnbd is turned on and [o] is [null], the operator |
| * super [==(o)] is called and no exception is thrown. |
| * @author msyabro |
| * @issue https://github.com/dart-lang/co19/issues/871 |
| */ |
| // Requirements=nnbd-strong |
| import '../../../Utils/expect.dart'; |
| |
| class S { |
| operator ==(other) { |
| return false; |
| } |
| } |
| |
| class C extends S { |
| test() { |
| dynamic n = null; |
| Expect.isFalse(super == n); |
| } |
| } |
| |
| main() { |
| new C().test(); |
| } |