diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug638735.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug638735.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+// Binary: cache/js-dbg-64-290712e55ade-linux
+// Flags: -j
+//
+var o9 = Function.prototype;
+var o13 = Array;
+function f5(o) {
+o.watch('p3', function() {});
+ox1 = wrap(o);
+}
+f5(o9);
+f5(o13);
+var o0 = [];
+function f3(o) {
+            var prop = Object.getOwnPropertyNames(ox1)[0];
+            if (prop) { Object.defineProperty(ox1, prop, {configurable: true,enumerable: true,unused: 1 }); }
+}(function() {
+for(var o3 in o0) {
+f3(f3);
+}
+})();
+  for (var i = 0; i < 9; i++)
+  {
+    new Array(1, 2);
+  }