diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug864099.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug864099.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+
+a = (function() {
+    with({}) var x, arguments, arguments
+})()
+
+b = (function() {
+    with({}) {
+        var x = Math, arguments
+        ({
+            get: (1 for (x in [])),
+        })
+    }
+})()