diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testIncElem3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testIncElem3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+var arr;
+for (var j = 0; j < 18; ++j ) {
+    arr = [,];
+    ++arr[0];
+}
+assertEq(isNaN(arr[0]), true);