Tweaks for compatibilities with summaries.

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 1789 matching lines @@
   @override
   bool get isSynthetic => hasModifier(Modifier.SYNTHETIC);
 
   @override
   LibraryElement get library =>
       getAncestor((element) => element is LibraryElement);
 
   @override
   ElementLocation get location {
     if (_cachedLocation == null) {
+      if (library == null) {
+        return new ElementLocationImpl.con1(this);
+      }
       _cachedLocation = new ElementLocationImpl.con1(this);
     }
     return _cachedLocation;
   }
 
   @override
   String get name => _name;
 
   void set name(String name) {
     this._name = name;
@@ skipping 33 matching lines @@
   }
 
   @override
   CompilationUnit get unit => context.resolveCompilationUnit(source, library);
 
   @override
   bool operator ==(Object object) {
     if (identical(this, object)) {
       return true;
     }
-    if (object == null || hashCode != object.hashCode) {
-      return false;
-    }
-    return object.runtimeType == runtimeType &&
-        (object as Element).location == location;
+    return object is Element &&
+        object.kind == kind &&
+        object.location == location;
   }
 
   /**
    * Append a textual representation of this element to the given [buffer].
    */
   void appendTo(StringBuffer buffer) {
     if (_name == null) {
       buffer.write("<unnamed ");
       buffer.write(runtimeType.toString());
       buffer.write(">");
@@ skipping 2698 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }