diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/arguments/genexpr-4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/arguments/genexpr-4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+// 'arguments' is lexically scoped in genexpr in function.
+
+function f() {
+    assertEq((arguments for (x of [0])).next(),
+             (arguments for (y of [1])).next());
+}
+f();