Support compilation of Hello World

tests/compiler/dart2js/serialization_test.dart

 // Copyright (c) 2015, 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 dart2js.serialization_test;
 
 import 'dart:io';
 import 'memory_compiler.dart';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/commandline_options.dart';
@@ skipping 225 matching lines @@
 class ElementPropertyEquivalence extends BaseElementVisitor<dynamic, Element> {
   const ElementPropertyEquivalence();
 
   void visit(Element element1, Element element2) {
     if (element1 == null && element2 == null) return;
     element1 = element1.declaration;
     element2 = element2.declaration;
     if (element1 == element2) return;
     check(element1, element2, 'kind', element1.kind, element2.kind);
     element1.accept(this, element2);
+    check(element1, element2, 'isSynthesized',
+        element1.isSynthesized, element2.isSynthesized);
   }
 
   @override
   void visitElement(Element e, Element arg) {
     throw new UnsupportedError("Unsupported element $e");
   }
 
   @override
   void visitLibraryElement(LibraryElement element1, LibraryElement element2) {
     checkElementIdentities(null, null, null, element1, element2);
@@ skipping 437 matching lines @@
   void visitPrefixElement(PrefixElement element1, PrefixElement element2) {
     check(
         element1, element2, 'isDeferred',
         element1.isDeferred, element2.isDeferred);
     checkElementIdentities(
         element1, element2, 'importedLibrary',
         element1.deferredImport, element2.deferredImport);
     // TODO(johnniwinther): Check members.
   }
 }