diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testDenseArrayProp.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testDenseArrayProp.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function testDenseArrayProp()
+{
+    [].__proto__.x = 1;
+    ({}).__proto__.x = 2;
+    var a = [[],[],[],({}).__proto__];
+    for (var i = 0; i < a.length; ++i)
+        uneval(a[i].x);
+    delete [].__proto__.x;
+    delete ({}).__proto__.x;
+    return "ok";
+}
+assertEq(testDenseArrayProp(), "ok");