Generate dynamic type errors according to spec.

tests/language/src/Prefix22NegativeTest.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.
-//
-// Unresolved symbols should be reported as an static type warnings.
-// In this variant of test we turn warnings into errors.
-// VMOptions= --enable_type_checks
-
-#library("Prefix21NegativeTest.dart");
-#import("library12.dart", prefix:"lib12");
-
-class myClass {
-  myClass(lib12.Library13 p) { /// static type error
-  }
-}
-
-main() {
-  new myClass(null);
-}