|  | // Copyright (c) 2012, 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. | 
|  |  | 
|  | import "package:expect/expect.dart"; | 
|  |  | 
|  | class A { | 
|  | final x; | 
|  | const A(this.x); | 
|  | const A.named([this.x]); | 
|  | const A.named2([this.x = 2]); | 
|  | } | 
|  |  | 
|  | class B extends A { | 
|  | const B(x) : super(x + 10); | 
|  | const B.named_() : super.named(); | 
|  | const B.named(x) : super.named(x + 10); | 
|  | const B.named2_() : super.named2(); | 
|  | const B.named2(x) : super.named2(x + 10); | 
|  | } | 
|  |  | 
|  | const b1 = const B(0); | 
|  | const b2 = const B.named_(); | 
|  | const b3 = const B.named(1); | 
|  | const b4 = const B.named2_(); | 
|  | const b5 = const B.named2(3); | 
|  |  | 
|  | main() { | 
|  | Expect.equals(10, b1.x); | 
|  | Expect.equals(null, b2.x); | 
|  | Expect.equals(11, b3.x); | 
|  | Expect.equals(2, b4.x); | 
|  | Expect.equals(13, b5.x); | 
|  | } |