Changes to handle unresolved qualified identifiers.

tests/language/src/Prefix13NegativeTest.dart

Index: tests/language/src/Prefix13NegativeTest.dart
===================================================================
--- tests/language/src/Prefix13NegativeTest.dart	(revision 0)
+++ tests/language/src/Prefix13NegativeTest.dart	(revision 0)
@@ -0,0 +1,16 @@
+// Copyright (c) 2011, 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 error.
+
+#library("Prefix13NegativeTest.dart");
+#import("library12.dart", prefix:"lib12");
+
+class myClass extends lib12.Library13 {
+  myClass(int this.fld) : super(0);
+  int fld;
+}
+
+main() {
+}