diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testNestedForIn.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testNestedForIn.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function testNestedForIn() {
+    var a = {x: 1, y: 2, z: 3};
+    var s = '';
+    for (var p1 in a)
+        for (var p2 in a)
+            s += p1 + p2 + ' ';
+    return s;
+}
+assertEq(testNestedForIn(), 'xx xy xz yx yy yz zx zy zz ');