Fix for enum signatures.

pkg/analyzer/lib/src/dart/element/element.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 analyzer.src.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 382 matching lines @@
   }
 
   @override
   accept(ElementVisitor visitor) => visitor.visitClassElement(this);
 
   @override
   void appendTo(StringBuffer buffer) {
     if (isAbstract) {
       buffer.write('abstract ');
     }
-    buffer.write('class ');
+    if (isEnum) {
+      buffer.write('enum ');
+    } else {
+      buffer.write('class ');
+    }
     String name = displayName;
     if (name == null) {
       buffer.write("{unnamed class}");
     } else {
       buffer.write(name);
     }
     int variableCount = _typeParameters.length;
     if (variableCount > 0) {
       buffer.write("<");
       for (int i = 0; i < variableCount; i++) {
@@ skipping 4141 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }