Handle typedefs in registerRequiredType.

tests/language/type_variable_typedef_test.dart

Index: tests/language/type_variable_typedef_test.dart
diff --git a/tests/language/type_variable_typedef_test.dart b/tests/language/type_variable_typedef_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..80cf1d534643b0a26a09ad4b8033718fce646511
--- /dev/null
+++ b/tests/language/type_variable_typedef_test.dart
@@ -0,0 +1,30 @@
+// Copyright (c) 2013, 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.
+
+// Test that rti dependency registration takes type variables within typedefs
+// into account.
+
+import 'package:expect/expect.dart';
+
+typedef Foo<T>(T t);
+
+class A<T> {
+  m() => new B<Foo<T>>();
+}
+
+class B<T> {
+  m(o) => o is T;
+}
+
+foo(int i) {}
+bar(String s) {}
+
+void main() {
+  Expect.isTrue(new A<int>().m().m(foo));
+  Expect.isFalse(new A<int>().m().m(bar));
+  Expect.isFalse(new A<String>().m().m(foo));
+  Expect.isTrue(new A<String>().m().m(bar));
+  Expect.isFalse(new A<double>().m().m(foo));
+  Expect.isFalse(new A<double>().m().m(bar));
+}