diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/arguments/genexpr-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/arguments/genexpr-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+// 'arguments' is lexically scoped in genexprs at toplevel.
+
+var arguments = 8;
+assertEq((arguments for (x of [1])).next(), 8);