Support runtime check of function types.

tests/language/function_subtype_bound_closure1_test.dart

Index: tests/language/function_subtype_bound_closure1_test.dart
diff --git a/tests/language/function_subtype_bound_closure1_test.dart b/tests/language/function_subtype_bound_closure1_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e3454e27af3360126f059b5af65749ed9d981e0f
--- /dev/null
+++ b/tests/language/function_subtype_bound_closure1_test.dart
@@ -0,0 +1,53 @@
+// 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 against generic typedefs.
+
+import 'package:expect/expect.dart';
+
+typedef int Foo<T>(T a, [String b]);
+typedef int Bar<T>(T a, [String b]);
+typedef int Baz<T>(T a, {String b});
+typedef int Boz<T>(T a);
+
+class C {
+  int foo(bool a, [String b]) => null;
+  int baz(bool a, {String b}) => null;
+}
+
+main() {
+  var c = new C();
+  var foo = c.foo;
+  Expect.isTrue(foo is Foo<bool>, 'foo is Foo<bool>');
+  Expect.isTrue(foo is Bar<bool>, 'foo is Bar<bool>');
+  Expect.isFalse(foo is Baz<bool>, 'foo is Baz<bool>');
+  Expect.isTrue(foo is Boz<bool>, 'foo is Boz<bool>');
+
+  Expect.isFalse(foo is Foo<int>, 'foo is Foo<int>');
+  Expect.isFalse(foo is Bar<int>, 'foo is Bar<int>');
+  Expect.isFalse(foo is Baz<int>, 'foo is Baz<int>');
+  Expect.isFalse(foo is Boz<int>, 'foo is Boz<int>');
+
+  Expect.isTrue(foo is Foo, 'foo is Foo');
+  Expect.isTrue(foo is Bar, 'foo is Bar');
+  Expect.isFalse(foo is Baz, 'foo is Baz');
+  Expect.isTrue(foo is Boz, 'foo is Boz');
+
+  var baz = c.baz;
+  Expect.isFalse(baz is Foo<bool>, 'baz is Foo<bool>');
+  Expect.isFalse(baz is Bar<bool>, 'baz is Bar<bool>');
+  Expect.isTrue(baz is Baz<bool>, 'baz is Baz<bool>');
+  Expect.isTrue(baz is Boz<bool>, 'baz is Boz<bool>');
+
+  Expect.isFalse(baz is Foo<int>, 'baz is Foo<int>');
+  Expect.isFalse(baz is Bar<int>, 'baz is Bar<int>');
+  Expect.isFalse(baz is Baz<int>, 'baz is Baz<int>');
+  Expect.isFalse(baz is Boz<int>, 'baz is Boz<int>');
+
+  Expect.isFalse(baz is Foo, 'baz is Foo');
+  Expect.isFalse(baz is Bar, 'baz is Bar');
+  Expect.isTrue(baz is Baz, 'baz is Baz');
+  Expect.isTrue(baz is Boz, 'baz is Boz');
+}