Support runtime check of function types.

tests/language/function_subtype_call1_test.dart

Index: tests/language/function_subtype_call1_test.dart
diff --git a/tests/language/function_subtype_call1_test.dart b/tests/language/function_subtype_call1_test.dart
new file mode 100644
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+++ b/tests/language/function_subtype_call1_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 classes with call functions.
+
+import 'package:expect/expect.dart';
+
+typedef void Foo(bool a, [String b]);
+typedef void Bar(bool a, [String b]);
+typedef void Baz(bool a, {String b});
+typedef void Boz(bool a);
+
+class C1<T> {
+  void call(T a, [String b]) {}
+}
+
+class C2<T> {
+  void call(T a, {String b}) {}
+}
+
+main() {
+  Expect.isTrue(new C1<bool>() is Foo, 'new C1<bool>() is Foo');
+  Expect.isTrue(new C1<bool>() is Bar, 'new C1<bool>() is Bar');
+  Expect.isFalse(new C1<bool>() is Baz, 'new C1<bool>() is Baz');
+  Expect.isTrue(new C1<bool>() is Boz, 'new C1<bool>() is Boz');
+
+  Expect.isFalse(new C1<int>() is Foo, 'new C1<int>() is Foo');
+  Expect.isFalse(new C1<int>() is Bar, 'new C1<int>() is Bar');
+  Expect.isFalse(new C1<int>() is Baz, 'new C1<int>() is Baz');
+  Expect.isFalse(new C1<int>() is Boz, 'new C1<int>() is Boz');
+
+  Expect.isTrue(new C1() is Foo, 'new C1() is Foo');
+  Expect.isTrue(new C1() is Bar, 'new C1() is Bar');
+  Expect.isFalse(new C1() is Baz, 'new C1() is Baz');
+  Expect.isTrue(new C1() is Boz, 'new C1() is Boz');
+
+  Expect.isFalse(new C2<bool>() is Foo, 'new C2<bool>() is Foo');
+  Expect.isFalse(new C2<bool>() is Bar, 'new C2<bool>() is Bar');
+  Expect.isTrue(new C2<bool>() is Baz, 'new C2<bool>() is Baz');
+  Expect.isTrue(new C2<bool>() is Boz, 'new C2<bool>() is Boz');
+
+  Expect.isFalse(new C2<int>() is Foo, 'new C2<int>() is Foo');
+  Expect.isFalse(new C2<int>() is Bar, 'new C2<int>() is Bar');
+  Expect.isFalse(new C2<int>() is Baz, 'new C2<int>() is Baz');
+  Expect.isFalse(new C2<int>() is Boz, 'new C2<int>() is Boz');
+
+  Expect.isFalse(new C2() is Foo, 'new C2() is Foo');
+  Expect.isFalse(new C2() is Bar, 'new C2() is Bar');
+  Expect.isTrue(new C2() is Baz, 'new C2() is Baz');
+  Expect.isTrue(new C2() is Boz, 'new C2() is Boz');
+}