diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/array-holes-6.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/array-holes-6.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+// for-of visits each hole in an array full of holes.
+
+var n = 0;
+for (var x of Array(5)) {
+    assertEq(x, undefined);
+    n++;
+}
+assertEq(n, 5);