diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/hole.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/hole.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+function f() {
+    var a;
+    for (var i=0; i<50; i++) {
+        a = [i, , [,, i*3], ];
+    }
+    return a;
+}
+Array.prototype[1] = 123;
+var arr = f();
+assertEq(arr.length, 3);
+assertEq(arr.toString(), "49,123,,123,147");