Support runtime check of function types.

tests/language/function_subtype_closure0_test.dart

Index: tests/language/function_subtype_closure0_test.dart
diff --git a/tests/language/function_subtype_closure0_test.dart b/tests/language/function_subtype_closure0_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..13645be9edd316bf707db34a984bb0745aa6e636
--- /dev/null
+++ b/tests/language/function_subtype_closure0_test.dart
@@ -0,0 +1,25 @@
+// 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 of static closures.

[karlklose, 2013/06/20 13:11:04]

'closures' -> 'functions'?

[Johnni Winther, 2013/06/21 12:19:15]

Done.

+
+import 'package:expect/expect.dart';

[karlklose, 2013/06/20 13:11:04]

Currently this is not used.

[Johnni Winther, 2013/06/21 12:19:15]

It is now.

+
+typedef I<T> f2<T>();
+
+class X {
+  static J<bool> f1() => null;
+}
+
+class C<T> {
+  C(f2<T> f, C<J> c);

[karlklose, 2013/06/20 13:11:04]

Why this second argument?

[Johnni Winther, 2013/06/21 12:19:15]

Not needed. Removed.

+}
+
+class I<T> {}
+class J<T> extends I<int> {}
+
+main() {
+  new C<int>(X.f1, null);

[karlklose, 2013/06/20 13:11:04]

Please add a negative test, too. You'll have to wrap them in an isCheckedMode
test, so that the negative test is not run in unchecked mode.

[Johnni Winther, 2013/06/21 12:19:15]

Done.

+}