|  | // Copyright (c) 2011, 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"; | 
|  |  | 
|  | String? message; | 
|  |  | 
|  | class A { | 
|  | int x; | 
|  | A(i) : x = i { | 
|  | message = '${message}A($i)'; | 
|  | } | 
|  | } | 
|  |  | 
|  | class B extends A { | 
|  | int y; | 
|  | B(i) | 
|  | : y = i++, | 
|  | super(i + 5) { | 
|  | message = '${message}B($i)'; | 
|  | } | 
|  | } | 
|  |  | 
|  | class C extends B { | 
|  | var z; | 
|  | C(i) | 
|  | : z = i, | 
|  | super(i * 3) { | 
|  | message = '${message}C($i)'; | 
|  | } | 
|  | } | 
|  |  | 
|  | main() { | 
|  | message = ''; | 
|  | var c = C(7); | 
|  | Expect.equals(27, c.x); | 
|  | Expect.equals(21, c.y); | 
|  | Expect.equals(7, c.z); | 
|  | Expect.equals('A(27)B(22)C(7)', message); | 
|  | } |