Include additional information into RenameFeedback.

pkg/analysis_server/lib/src/services/refactoring/refactoring.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 services.refactoring;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' show
     RefactoringMethodParameter, SourceChange;
@@ skipping 294 matching lines @@
     if (element is LocalElement) {
       return new RenameLocalRefactoringImpl(searchEngine, element);
     }
     if (element.enclosingElement is ClassElement) {
       return new RenameClassMemberRefactoringImpl(searchEngine, element);
     }
     return null;
   }
 
   /**
+   * Returns the human-readable description of the kind of element being renamed
+   * (such as “class” or “function type alias”).
+   */
+  String get elementKindName;
+
+  /**
    * Sets the new name for the [Element].
    */
   void set newName(String newName);
 
   /**
    * Returns the old name of the [Element] being renamed.
    */
   String get oldName;
 
   /**
    * Validates that the [newName] is a valid identifier and is appropriate for
    * the type of the [Element] being renamed.
    *
    * It does not perform all the checks (such as checking for conflicts with any
    * existing names in any of the scopes containing the current name), as many
    * of these checkes require search engine. Use [checkFinalConditions] for this
    * level of checking.
    */
   RefactoringStatus checkNewName();
 }