| // Copyright (c) 2018, 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. | |
| class A implements B { | |
| var x; | |
| A(Object this.x); | |
| } | |
| class B { | |
| factory B(String s) = A; | |
| } | |
| main() { | |
| B(42 as dynamic); //# 01: runtime error | |
| } |