remove duplicate completion suggestions

pkg/analysis_server/test/services/completion/local_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.dart.local;
 
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/completion/local_computer.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 715 matching lines @@
     CompletionSuggestion suggestion =
         assertSuggestLocalMethod('m', 'A', 'void');
     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_shadowed_name() {
+    addTestSource('var a; class A { var a; m() { ^ } }');
+    expect(computeFast(), isTrue);
+    assertSuggestLocalField('a', null);
+  }
 }