Support resolution of indexed operators.

lib/compiler/implementation/resolver.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.
 
 interface TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
   Type getType(TypeAnnotation annotation);
 }
 
@@ skipping 1300 matching lines @@
           name,
           node.argumentsNode is Prefix);
     }
     Selector selector = mapping.getSelector(node);
     if (Selector.GETTER === selector) {
       world.registerDynamicGetter(name, selector);
     } else if (Selector.SETTER === selector) {
       world.registerDynamicSetter(name, selector);
       // Also register the getter for compound assignments.
       world.registerDynamicGetter(name, Selector.GETTER);
+    } else if (Selector.INDEX_AND_INDEX_SET === selector) {
+      register(op, selector) {
+        world.registerDynamicInvocation(Elements.constructOperatorName(
+            const SourceString('operator'), new SourceString(op)), selector);
+      }
+      register('[]', Selector.INDEX);
+      register('[]=', Selector.INDEX_SET);
     } else {
       world.registerDynamicInvocation(name, selector);
     }
     var interceptor = new Interceptors(compiler).getStaticInterceptor(
         name,
         node.argumentCount());
     if (interceptor !== null) {
       world.registerStaticUse(interceptor);
     }
   }
@@ skipping 1070 matching lines @@
   TopScope(LibraryElement library) : super(null, library);
   Element lookup(SourceString name) {
     return library.find(name);
   }
 
   Element add(Element newElement) {
     throw "Cannot add an element in the top scope";
   }
   String toString() => '$element';
 }