Operators.

frog/leg/compiler.dart

 // Copyright (c) 2012, 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.
 
 class WorkItem {
   final Element element;
   TreeElements resolutionTree;
   Function run;
   Map<int, BailoutInfo> bailouts = null;
 
@@ skipping 116 matching lines @@
     return true;
   }
 
   void scanCoreLibrary() {
     String fileName = io.join([legDirectory, 'lib', 'core.dart']);
     currentElement = new CompilationUnitElement(
         readScript(fileName), currentLibrary);
     scanner.scan(currentElement);
     // Make our special function a foreign kind.
     universe.define(new ForeignElement(const SourceString('JS')), this);
-    universe.define(new ForeignElement(const SourceString('UNINTERCEPTED')),
-                    this);
+    universe.define(new ForeignElement(
+        const SourceString('UNINTERCEPTED')), this);
+    universe.define(new ForeignElement(
+        const SourceString('JS_HAS_EQUALS')), this);
     // TODO(ngeoffray): Lazily add this method.
     universe.invokedNames[NO_SUCH_METHOD] = new Set<int>.from(<int>[2]);
   }
 
   void enqueueInvokedInstanceMethods() {
     // TODO(floitsch): find a more efficient way of doing this.
     // Run through the classes and see if we need to compile methods.
     for (ClassElement classElement in universe.instantiatedClasses) {
       for (ClassElement currentClass = classElement;
            currentClass !== null;
@@ skipping 158 matching lines @@
 
 class CompilerCancelledException implements Exception {
   final String reason;
   CompilerCancelledException(this.reason);
 
   String toString() {
     String banner = 'compiler cancelled';
     return (reason !== null) ? '$banner: $reason' : '$banner';
   }
 }