Fix crash in dartc when given cyclic type variable bounds.

tests/language/src/FunctionTypeAlias2NegativeTest.dart

Index: tests/language/src/FunctionTypeAlias2NegativeTest.dart
diff --git a/tests/language/src/FunctionTypeAlias2NegativeTest.dart b/tests/language/src/FunctionTypeAlias2NegativeTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2bd9c9c3f769ebf555821afd430d77ee5ae4b796
--- /dev/null
+++ b/tests/language/src/FunctionTypeAlias2NegativeTest.dart
@@ -0,0 +1,13 @@
+// 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.
+
+
+typedef void funcType(int arg);
+
+class A extends funcType {  // illegal, funcType is not a class
+}
+
+main() {
+  new A();
+}