diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/next-surfaces.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/next-surfaces.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+// Test superficial features of the Iterator.prototype.next builtin function.
+
+assertEq(Iterator.prototype.next.length, 0);
+var desc = Object.getOwnPropertyDescriptor(Iterator.prototype, "next");
+assertEq(desc.configurable, true);
+assertEq(desc.enumerable, false);
+assertEq(desc.writable, true);