diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/iterator-proto-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/iterator-proto-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// Iterators of different collection types have different prototypes.
+
+load(libdir + "iteration.js");
+
+var aproto = Object.getPrototypeOf(Array()[std_iterator]());
+var mproto = Object.getPrototypeOf(Map()[std_iterator]());
+var sproto = Object.getPrototypeOf(Set()[std_iterator]());
+assertEq(aproto !== mproto, true);
+assertEq(aproto !== sproto, true);
+assertEq(mproto !== sproto, true);
+assertEq(aproto.next !== mproto.next, true);
+assertEq(aproto.next !== sproto.next, true);
+assertEq(mproto.next !== sproto.next, true);