| /* |
| * Copyright (c) 2019, 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 We say that a type T is nullable if Null <: T and not T <: Object. |
| * This is equivalent to the syntactic criterion that T is any of: |
| * Null |
| * S? for some S |
| * S* for some S where S is nullable |
| * FutureOr<S> for some S where S is nullable |
| * dynamic |
| * void |
| * |
| * @description Check that null can be assigned to nullable type. Test S? for |
| * some S. Test type aliases |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=nonfunction-type-aliases |
| // Requirements=nnbd-strong |
| class C {} |
| |
| typedef CAlias = C?; |
| typedef IntAlias = int?; |
| typedef StringAlias = String?; |
| |
| main() { |
| CAlias c = C(); |
| c = null; |
| |
| IntAlias i = null; |
| |
| StringAlias s = ""; |
| s = null; |
| } |
