| // Copyright (c) 2020, 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 The NORM relation defines the canonical representative of classes |
| /// of equivalent types... |
| /// This is based on the following equations: |
| /// FutureOr<T> == T if Future<T> <: T |
| /// |
| /// @description Checks that if Future<T> is not subtype of T then |
| /// FutureOr<T> != T |
| /// |
| /// @author sgrekhov@unipro.ru |
| |
| |
| import 'dart:async'; |
| |
| class T {} |
| class A<X> {} |
| class B<X> implements A<X> {} |
| |
| class CT extends B<FutureOr<T>> implements A<T> {} |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| class CN extends B<FutureOr<Null>> implements A<Null> {} |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| class CF extends B<FutureOr<Future>> implements A<Future> {} |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| main() { |
| new CT(); |
| new CN(); |
| new CF(); |
| } |