diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug765478.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug765478.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+function test1() {
+    var input = arguments[undefined];
+}
+function test2() {
+    return arguments["length"];
+}
+test1();
+test2();