| /* |
| * 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 The grammar for types does not allow multiple successive ? |
| * operators on a type. That is, the grammar for types is nominally equivalent |
| * to: |
| * type' ::= functionType |
| * | qualified typeArguments? |
| * type ::= type' `?`? |
| * |
| * @description Check that it is no error to have multiple ? but not in the type |
| * declaration. Test type aliases |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=nonfunction-type-aliases |
| // Requirements=nnbd-strong |
| class A {} |
| |
| typedef AAlias1 = A?; |
| typedef AAlias2 = AAlias1?; |
| |
| main() { |
| AAlias1 a1 = null; |
| AAlias2 a2 = null; |
| } |
