Add another runtime check test case.

pkg/front_end/testcases/runtime_checks_new/derived_class_typed.dart

Index: pkg/front_end/testcases/runtime_checks_new/derived_class_typed.dart
diff --git a/pkg/front_end/testcases/runtime_checks_new/derived_class_typed.dart b/pkg/front_end/testcases/runtime_checks_new/derived_class_typed.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1dcf0de54e09469bcf1237f8d98ecf573c1cd347
--- /dev/null
+++ b/pkg/front_end/testcases/runtime_checks_new/derived_class_typed.dart
@@ -0,0 +1,26 @@
+// Copyright (c) 2017, 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.
+
+/*@testedFeatures=checks*/
+library test;
+
+class B<T> {
+  void f(T /*@checkFormal=semiSafe*/ /*@checkInterface=semiTyped*/ x) {}
+}
+
+class /*@forwardingStub=abstract void f(int x)*/ C extends B<int> {}
+
+void g1(B<num> b) {
+  b.f(1.5);
+}
+
+void g2(C c) {
+  c.f(1);
+}
+
+void test() {
+  g1(new C());
+}
+
+void main() {}