| /* |
| * 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); |
| } |
