| // Copyright (c) 2011, 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 Evaluation of the cast expression e as T proceeds as follows: |
| /// The expression e is evaluated to a value v. |
| /// Then, if T is malformed or deferred type, a dynamic error occurs. |
| /// Otherwise, if the interface of the class of v is a subtype of T, the cast |
| /// expression evaluates to v. |
| /// Otherwise, if v is null, the cast expression evaluates to v. |
| /// In all other cases, a CastError is thrown. |
| /// @description Checks that the type cast operator evaluates to null when |
| /// the first argument evaluates to null. |
| /// @author rodionov |
| |
| import '../../../Utils/expect.dart'; |
| |
| n() => null; |
| |
| class C {} |
| abstract class G<S, T> {} |
| typedef bool func(int); |
| |
| main() { |
| Expect.isNull(n() as int?, "null expected"); |
| Expect.isNull(null as C?, "null expected"); |
| Expect.isNull(n() as G<int, bool>?, "null expected"); |
| Expect.isNull(n() as func?, "null expected"); |
| } |