Fix mixin resolution order when multiple mixins present.

pkg/analysis_server/test/services/completion/imported_computer_test.dart

 // Copyright (c) 2014, 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.
 
 library test.services.completion.toplevel;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_cache.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
@@ skipping 460 matching lines @@
       expect(suggestion.parameterNames, hasLength(2));
       expect(suggestion.parameterNames[0], 'x');
       expect(suggestion.parameterTypes[0], 'dynamic');
       expect(suggestion.parameterNames[1], 'y');
       expect(suggestion.parameterTypes[1], 'int');
       expect(suggestion.requiredParameterCount, 2);
       expect(suggestion.hasNamedParameters, false);
     });
   }
 
+  test_mixin_ordering() {
+    // TODO(paulberry): The mixins are visited in the correct order, so we see
+    // M2.m() before M1.m(), as we should.  But the second (shadowed) result
+    // isn't being thrown out as it should.
+    addSource('/libA.dart', '''
+class B {}
+class M1 {
+  void m() {}
+}
+class M2 {
+  void m() {}
+}
+''');
+    addTestSource('''
+import '/libA.dart';
+class C extends B with M1, M2 {
+  void f() {
+    ^
+  }
+}
+''');
+    return computeFull((bool result) {
+      assertSuggestMethod('m', 'M2', 'void');
+    });
+  }
+
   /**
    * Ensure that completions in one context don't appear in another
    */
   test_multiple_contexts() {
 
     // Create a 2nd context with source
     var context2 = AnalysisEngine.instance.createAnalysisContext();
     context2.sourceFactory =
         new SourceFactory([AbstractContextTest.SDK_RESOLVER, resourceResolver]);
     String content2 = 'class ClassFromAnotherContext { }';
@@ skipping 97 matching lines @@
 
   @override
   test_partFile_TypeName2() {
     return super.test_partFile_TypeName2().then((_) {
       expect(
           request.cache.importKey,
           'library libA;import "/testB.dart";part "/testA.dart";');
     });
   }
 }