Support runtime check of function types.

tests/language/function_subtype_bound_closure7_test.dart

Index: tests/language/function_subtype_bound_closure7_test.dart
diff --git a/tests/language/function_subtype_bound_closure7_test.dart b/tests/language/function_subtype_bound_closure7_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5f24aa9d21c88d25ec6b555821edd7b2c7cf67fb
--- /dev/null
+++ b/tests/language/function_subtype_bound_closure7_test.dart
@@ -0,0 +1,33 @@
+// 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 function subtyping for bound closures.
+
+import 'package:expect/expect.dart';
+
+typedef void Foo<T>(T t);
+
+class Class<T> {
+  foo(Foo<T> o) => o is Foo<T>;
+}
+
+void bar(int i) {}
+
+void main() {
+  bool inCheckedMode = false;
+  try {
+    String a = 42;
+  } catch (e) {
+    inCheckedMode = true;
+  }
+
+  var f = new Class<int>().foo;
+  Expect.isTrue(f(bar));
+  if (inCheckedMode) {
+    Expect.throws(() => f(f), (e) => true);
+  } else {
+    Expect.isFalse(f(f));
+  }
+}