Handle private fields from mixins.

tests/language/private_other_mixin2.lib

 // Copyright (c) 2013, 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 '../../../time/time_server.dart' as time;
+// Dart test for testing access to private fields on mixins.
 
-// @static-clean
+library private_mixin2_other;
 
-/**
- * This test exists to ensure that the time sample compiles without errors.
- */
-void main() {
+class C1 {
+  int _field = 42;
+}
 
-}
+class C2 extends Object with C1 {
+  int get field => _field;
+}