diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testAccessCanonicalArgInGetElem.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testAccessCanonicalArgInGetElem.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+var o = {x:42};
+
+function f(index,param) {
+    arguments[1] = 0;
+    var ret = 0;
+    for (var i = 0; i < 5; ++i)
+        ret = arguments[index].x;
+    return ret;
+}
+
+assertEq(f(2,o,o), 42);
+assertEq(f(1,o,o), undefined);