diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug830045.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug830045.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+
+Array.prototype[1] = 'y';
+var a = [0, (8)];
+for (var i in a) {
+    delete a[1];
+}