Add support for malformed types and postpone some related errors from compile

tests/language/src/Prefix23NegativeTest.dart

Index: tests/language/src/Prefix23NegativeTest.dart
===================================================================
--- tests/language/src/Prefix23NegativeTest.dart	(revision 4727)
+++ tests/language/src/Prefix23NegativeTest.dart	(working copy)
@@ -1,10 +1,10 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 //
 // Unresolved symbols should be reported as an static type warnings.
 // In this variant of test we turn warnings into errors.
-// VMOptions=--fatal-type-errors --enable_type_errors
+// VMOptions=--fatal-type-errors --enable_type_checks
 
 #library("Prefix22NegativeTest.dart");
 #import("library12.dart", prefix:"lib12");