| // Copyright (c) 2017, 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. | |
| library test; | |
| class A { | |
| B b = throw ''; | |
| } | |
| class B { | |
| C? c; | |
| } | |
| class C {} | |
| class D extends C {} | |
| var a = new A(); | |
| var x = a.b.c; | |
| var y = a.b.c ??= new D(); | |
| main() {} |