diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/arrays-slow-4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/arrays-slow-4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+// for-of on an empty slow array does nothing.
+
+var a = [];
+a.slow = true;
+for (var x of a)
+    fail();