diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Array-of-4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Array-of-4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// Array.of does not trigger prototype setters.
+// (It defines elements rather than assigning to them.)
+
+var status = "pass";
+Object.defineProperty(Array.prototype, "0", {set: v => status = "FAIL 1"});
+assertEq(Array.of(1)[0], 1);
+assertEq(status, "pass");
+
+function Bag() {}
+Bag.of = Array.of;
+Object.defineProperty(Bag.prototype, "0", {set: v => status = "FAIL 2"});
+assertEq(Bag.of(1)[0], 1);
+assertEq(status, "pass");