Support runtime check of function types.

tests/language/function_subtype_typearg4_test.dart

Index: tests/language/function_subtype_typearg4_test.dart
diff --git a/tests/language/interceptor7_test.dart b/tests/language/function_subtype_typearg4_test.dart
similarity index 54%
copy from tests/language/interceptor7_test.dart
copy to tests/language/function_subtype_typearg4_test.dart
index 965ddfc800c1b1fa7971bd918391b1e806c00cf3..6d95de58e2fcb160ca870e0081233870ea946ec6 100644
--- a/tests/language/interceptor7_test.dart
+++ b/tests/language/function_subtype_typearg4_test.dart
@@ -1,16 +1,20 @@
 // 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.
+// Dart test program for constructors and initializers.
 
-// Test that dart2js uses the right interceptor when call a method on
-// something that has type number.
+// Check function subtyping of type arguments.
 
 import 'package:expect/expect.dart';
 
-var array = [];
+class C<T> {}
+
+class I {}
+class J extends I {}
+
+typedef I f1();
+typedef J f2();
 
 main() {
-  array.add(false);
-  var x = array[0] ? 1.5 : 2;
-  Expect.isTrue(x.isEven);
-}
+  Expect.isTrue(new C<f1>() is C<f2>);
+}