| // 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 |
| /// 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 otherwise NORM(FutureOr<T>) = FutureOr<NORM(T)>. |
| /// Test that NORM(FutureOr<T??>) == FutureOr<T?> and |
| /// NORM(FutureOr<Never?>) == FutureOr<Null> |
| /// |
| /// @author sgrekhov@unipro.ru |
| |
| // Requirements=nnbd-strong |
| import 'dart:async'; |
| |
| class T {} |
| class A<X> {} |
| class B<X> implements A<FutureOr<X?>> {} |
| class D<X> implements A<X> {} |
| |
| class C1 extends B<T?> implements A<FutureOr<T?>> {} |
| class C2 extends B<Never?> implements A<FutureOr<Null>> {} |
| |
| main() { |
| new C1(); |
| new C2(); |
| } |