diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/delete-array-elements.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/delete-array-elements.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+var a = [0,1,2,3,4,5,6,7,8,9,10];
+for (var i = 0; i < 10; i++)
+    delete a[9 - i];
+assertEq(a.length, 11);
+for (i = 0; i < 10; i++)
+    assertEq(a.hasOwnProperty(i), false);
+