Realize that this() is a closure send.

tests/language/call_this_test.dart

Index: tests/language/call_this_test.dart
===================================================================
--- tests/language/call_this_test.dart	(revision 0)
+++ tests/language/call_this_test.dart	(revision 0)
@@ -0,0 +1,18 @@
+// 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.
+
+// Test that dart2js treats [:this():] as a closure send.
+
+import "package:expect/expect.dart";
+
+class A {
+  call() => 42;
+  test1() => this();
+  test2() => (this)();
+}
+
+main() {
+  Expect.equals(42, (new A()).test1());
+  Expect.equals(42, (new A()).test2());
+}