Give different runtime type representations to different types with the same name.

tests/language/first_class_types_libraries_test.dart

Index: tests/language/first_class_types_libraries_test.dart
diff --git a/tests/language/first_class_types_libraries_test.dart b/tests/language/first_class_types_libraries_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b04c57244f9942c61b7bb04e94198ac7c6ff7c81
--- /dev/null
+++ b/tests/language/first_class_types_libraries_test.dart
@@ -0,0 +1,24 @@
+// 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.
+
+import 'first_class_types_lib1.dart' as lib1;
+import 'first_class_types_lib2.dart' as lib2;
+
+class C<X> {}
+
+sameType(a, b) {
+  Expect.identical(a.runtimeType, b.runtimeType);
+}
+
+differentType(a, b) {
+  print("a: ${a.runtimeType}");
+  print("b: ${b.runtimeType}");
+  Expect.isFalse(identical(a.runtimeType, b.runtimeType));
+}
+
+main() {
+  sameType(new lib1.A(), new lib1.A());
+  differentType(new lib1.A(), new lib2.A());
+  differentType(new C<lib1.A>(), new C<lib2.A>());
+}