diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-clear-5.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-clear-5.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// Set.clear is unaffected by deleting/monkeypatching Set.prototype.{delete,iterator}.
+
+var data = ["a", 1, {}];
+var s1 = Set(data), s2 = Set(data);
+
+delete Set.prototype.delete;
+delete Set.prototype.iterator;
+s1.clear();
+assertEq(s1.size, 0);
+
+Set.prototype.delete = function () { throw "FAIL"; };
+Set.prototype.iterator = function () { throw "FAIL"; };
+s2.clear();
+assertEq(s2.size, 0);