diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/forVarInWith.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/forVarInWith.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function forVarInWith() {
+    function foo() ({notk:42});
+    function bar() ({p:1, q:2, r:3, s:4, t:5});
+    var o = foo();
+    var a = [];
+    with (o) {
+        for (var k in bar())
+            a[a.length] = k;
+    }
+    return a.join("");
+}
+assertEq(forVarInWith(), "pqrst");