Remove extra CompileTimeErrorCode.DUPLICATE_DEFINITION.

pkg/analyzer/lib/src/generated/resolver.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 engine.resolver;
 
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/src/generated/utilities_collection.dart';
@@ skipping 11819 matching lines @@
   /**
    * Return the listener that is to be informed when an error is encountered.
    *
    * @return the listener that is to be informed when an error is encountered
    */
   AnalysisErrorListener get errorListener;
 
   /**
    * Add the given element to this scope. If there is already an element with the given name defined
    * in this scope, then an error will be generated and the original element will continue to be
-   * mapped to the name. If there is an element with the given name in an enclosing scope, then a
-   * warning will be generated but the given element will hide the inherited element.
+   * mapped to the name.

[Brian Wilkerson, 2015/06/08 22:09:01]

Given that the code hasn't changed, do we want to restore the comment?

    *
    * @param element the element to be added to this scope
    */
   void define(Element element) {
     String name = _getName(element);
     if (name != null && !name.isEmpty) {
       if (_definedNames.containsKey(name)) {
         errorListener
             .onError(getErrorForDuplicate(_definedNames[name], element));
       } else {
@@ skipping 3636 matching lines @@
     nonFields.add(node);
     return null;
   }
 
   @override
   Object visitNode(AstNode node) => node.accept(TypeResolverVisitor_this);
 
   @override
   Object visitWithClause(WithClause node) => null;
 }