Fix for the js-interop crash

tests/html/js_typed_interop_anonymous2_test.dart

Index: tests/html/js_typed_interop_anonymous2_test.dart
diff --git a/tests/html/js_typed_interop_anonymous2_test.dart b/tests/html/js_typed_interop_anonymous2_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ed0e732a3f6b55f4588cf36ac452aa7766b86ff8
--- /dev/null
+++ b/tests/html/js_typed_interop_anonymous2_test.dart
@@ -0,0 +1,48 @@
+// Copyright (c) 2015, 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.
+
+library js_typed_interop_anonymous2_test;
+
+import 'dart:html';
+import 'dart:js' as js;
+
+import 'package:js/js.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+
+@JS() @anonymous
+class A {
+  external factory A({B b});
+
+  external B get b;
+}
+
+@JS() @anonymous
+class B {
+  external factory B({C c});
+
+  external C get c;
+}
+
+@JS() @anonymous
+class C {
+  external factory C();
+}
+
+// D is unreachable, and that is OK
+@JS() @anonymous
+class D {
+  external factory D();
+}
+
+main() {
+  useHtmlConfiguration();
+
+  test('simple', () {
+    var b = new B();
+    var a = new A(b: b);
+    expect(a.b, equals(b));
+    expect(b.c, isNull);
+  });
+}