diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/deleteToString.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/deleteToString.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,5 @@
+
+/* Inheritance of shadowed function properties from Object.prototype. */
+
+delete Function.prototype.toString;
+assertEq(Function.prototype.toString, Object.prototype.toString);