Support runtime check of function types.

tests/language/function_subtype_not0_test.dart

Index: tests/language/function_subtype_not0_test.dart
diff --git a/tests/language/function_subtype_not0_test.dart b/tests/language/function_subtype_not0_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7b8d8643602662122fd2faa2b7a5392716836ddb
--- /dev/null
+++ b/tests/language/function_subtype_not0_test.dart
@@ -0,0 +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.
+
+// Check negative function subtyping tests.
+
+import 'package:expect/expect.dart';
+
+typedef void Foo<T>(T t);
+typedef void Bar(int i);
+
+void bar(int i) {}
+
+void main() {
+  Expect.isFalse(bar is! Foo);
+  Expect.isTrue(bar is! Foo<bool>);
+  Expect.isFalse(bar is! Foo<int>);
+  Expect.isFalse(bar is! Bar);
+}