| // Copyright (c) 2023, 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 |
| /// ⟨operatorSignature⟩ ::= |
| /// ⟨type⟩? operator ⟨operator⟩ ⟨formalParameterList⟩ |
| /// ⟨operator⟩ ::= ‘~’ |
| /// | ⟨binaryOperator⟩ |
| /// | ‘[]’ |
| /// | ‘[]=’ |
| /// ⟨binaryOperator⟩ ::= ⟨multiplicativeOperator⟩ |
| /// | ⟨additiveOperator⟩ |
| /// | ⟨shiftOperator⟩ |
| /// | ⟨relationalOperator⟩ |
| /// | ‘==’ |
| /// | ⟨bitwiseOperator⟩ |
| /// |
| /// @description Checks that it is not an error to declare an abstract |
| /// user-defined operator |
| /// @author sgrekhov22@gmail.com |
| |
| import '../../../../Utils/expect.dart'; |
| |
| abstract class A { |
| int operator +(int other); |
| } |
| |
| mixin M { |
| int operator *(int other); |
| } |
| |
| class C extends A with M { |
| int operator +(int other) => 1; |
| int operator *(int other) => 2; |
| } |
| |
| main() { |
| Expect.equals(1, C() + 42); |
| Expect.equals(2, C() * 42); |
| } |
