| // Copyright (c) 2020, 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. | |
| part 'non_nullable_optional_part.dart'; | |
| main() {} | |
| method1({int a}) {} | |
| method2([int a]) {} |