| // Copyright (c) 2019, 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion An equality check like [MyList(object) == x] is always disallowed |
| /// because an extension cannot declare a member named [==], and [MyList(object) |
| /// != x] is disallowed because it's also defined in terms of a member named |
| /// [==]. |
| /// @description Check that it's not allowed to use [==] and [!=]construction for |
| /// the extensions. |
| /// @author iarkh@unipro.ru |
| |
| extension MySimpleExt on String { |
| bool get test => false; |
| int getANum() => 12345; |
| void tryme() {} |
| } |
| |
| main() { |
| bool res1 = MySimpleExt("testme") == true; //# 01: compile-time error |
| var res2 = MySimpleExt("testme") == 14; //# 02: compile-time error |
| |
| bool res3 = MySimpleExt("testme") != true; //# 03: compile-time error |
| var res4 = MySimpleExt("testme") != 128; //# 04: compile-time error |
| } |
