Const variable declarations accepted in the parser.

tests/language/const_var_helper.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.
+// All things regarding constant variables.
 
-#library('test2.dart');
+/** Helper library for 'const_var_test.dart' */
+#library('const_var_helper');
 
-#source('../$SRC/test2a.dart');
+class Foo<E> {
+  const Foo();
+}
 
-int test2() {
-  var result = test2a();
-  Expect.equals(2, result);
-  return result;
-}