dart2dart support for instantiatin simple top-level class:

tests/compiler/dart2js/unparser_test.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.
 
 #import('dart:uri');
 #import('parser_helper.dart');
 #import("../../../lib/compiler/compiler.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 
 testUnparse(String statement) {
   Node node = parseStatement(statement);
   Expect.equals(statement, node.unparse());
 }
 
 testUnparseMember(String member) {
   Node node = parseMember(member);
   Expect.equals(member, node.unparse());
 }
 
 final coreLib = @'''
 #library('corelib');
-interface Object {}
+class Object {}
 interface bool {}
 interface num {}
 interface int extends num {}
 interface double extends num {}
 interface String {}
 interface Function {}
 interface List {}
 interface Closure {}
 interface Dynamic {}
 interface Null {}
@@ skipping 87 matching lines @@
 
 testTopLevelField() {
   final src = 'final String x="asd";main(){x;}';
   testDart2Dart(src, (String s) => Expect.equals(src, s));
 }
 
 testSimpleObjectInstantiation() {
   testUnparse('main(){new Object();}');
 }
 
+testSimpleTopLevelClass() {
+  final src = 'main(){new A();}class A{A(){}}';
+  testDart2Dart(src, (String s) => Expect.equals(src, s));
+}
+
 main() {
   testGenericTypes();
   testForLoop();
   testEmptyList();
   testClosure();
   testIndexedOperatorDecl();
   testNativeMethods();
   testPrefixIncrements();
   testConstModifier();
   testSimpleFileUnparse();
   testSimpleObjectInstantiation();
+  testSimpleTopLevelClass();
   testTopLevelField();
 }