| // Copyright (c) 2021, 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 |
| /// NORM(FutureOr<T>) = |
| /// let S be NORM(T) |
| /// if S is a top type then S |
| /// if S is Object then S |
| /// if S is Object* then S |
| /// if S is Never then Future<Never> |
| /// if S is Null then Future<Null>? |
| /// else FutureOr<S> |
| /// |
| /// @description Checks that if NORM(T) is a top type then NORM(FutureOr<T>) = |
| /// NORM(T) |
| /// |
| /// @author sgrekhov@unipro.ru |
| |
| // Requirements=nnbd-weak |
| import 'dart:async'; |
| |
| class A<X> {} |
| class B<X> implements A<X> {} |
| |
| class CD1 extends B<FutureOr<dynamic>> implements A<dynamic> {} |
| class CD2 extends B<FutureOr<dynamic>> implements A<dynamic?> {} |
| |
| class CO extends B<FutureOr<Object?>> implements A<Object?> {} |
| class CV extends B<FutureOr<void>> implements A<void> {} |
| |
| main() { |
| new CD1(); |
| new CD2(); |
| new CO(); |
| new CV(); |
| } |