|  | // 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. | 
|  |  | 
|  | // dart2jsOptions=--strong | 
|  |  | 
|  | import 'package:expect/expect.dart'; | 
|  |  | 
|  | abstract class A { | 
|  | m({a, b}); | 
|  | } | 
|  |  | 
|  | class B implements A { | 
|  | noSuchMethod(Invocation i) { | 
|  | return '${i.namedArguments[#a]},${i.namedArguments[#b]}'; | 
|  | } | 
|  | } | 
|  |  | 
|  | void main() { | 
|  | A x = new B(); | 
|  | Expect.equals('3,4', x.m(a: 3, b: 4)); | 
|  | Expect.equals('3,4', x.m(b: 4, a: 3)); | 
|  | } |