| // 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 of types is extended to allow any type to be suffixed |
| /// with a ? (e.g. int?) indicating the nullable version of that type. |
| /// |
| /// @description Check that any type can be suffixed with a ? indicating the |
| /// nullable version of that type. Test function types |
| /// @author sgrekhov@unipro.ru |
| |
| // Requirements=nnbd-strong |
| typedef void foo(); |
| |
| foo? bar(foo? v) => v; |
| |
| main() { |
| foo? f = null; |
| f = bar(f); |
| } |
