diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug525028.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug525028.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+// don't crash
+
+function f() {
+    var _L1 = arguments;
+    for (var i = 0; i < _L1.length; i++) {
+        if (typeof _L1[i] == "string")
+            _L1[i] = new Object();
+    }
+    print(arguments[2]);
+}
+
+f(1, 2, "3", 4, 5);
+f(1, 2, "3", 4, 5);
+f(1, 2, "3", 4, 5);
+f(1, 2, "3", 4, 5);
+