| // 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(X extends T) = |
| /// let S be NORM(T) |
| /// if S is Never then Never |
| /// else X extends T |
| /// |
| /// @description Checks that if NORM(T) is Never then NORM(X extends T) = Never |
| /// |
| /// @author sgrekhov@unipro.ru |
| |
| // Requirements=nnbd-strong |
| class A<X> {} |
| class B<X extends Never> implements A<X> {} |
| |
| class C extends B<Never> implements A<Never> {} |
| |
| main() { |
| new C(); |
| } |
