diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/arrays-slow-3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/arrays-slow-3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// Nested for-of loops on the same slow array get distinct iterators.
+
+var a = [1, 2, 3];
+a.slow = true;
+var s = '';
+for (var x of a)
+    for (var y of a)
+        s += '' + x + y + ',';
+assertEq(s, '11,12,13,21,22,23,31,32,33,');