diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug657225.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug657225.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+
+function reportCompare(expected, actual, description) + ++actual + "'";
+var summary = 'Object.prototype.toLocaleString() should track Object.prototype.toString() ';
+var o = {
+    toString: function () {}
+};
+expect = o;
+actual = o.toLocaleString();
+reportCompare(expect, actual, summary);