| // Copyright (c) 2015, 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 Evaluation of a conditional property extraction expression e of |
| * the form e1?.id is equivalent to the evaluation of the expression |
| * ((x) => x == null?null : x.id)(e1), unless e1 is a type literal, in which |
| * case it is equivalent to e1.m. |
| * @description Check that e1?.id is equivalent to |
| * ((x) => x == null?null : x.id)(e1). |
| * @author sgrekhov@unipro.ru |
| */ |
| import '../../../Utils/expect.dart'; |
| |
| class C { |
| String id = "id"; |
| } |
| |
| main() { |
| var c1 = new C() as C?; |
| C? c2 = null; |
| Expect.equals("id", c1?.id); |
| Expect.isNull(c2?.id); |
| } |