michael@0: // Array.of does not trigger prototype setters.
michael@0: // (It defines elements rather than assigning to them.)
michael@0: 
michael@0: var status = "pass";
michael@0: Object.defineProperty(Array.prototype, "0", {set: v => status = "FAIL 1"});
michael@0: assertEq(Array.of(1)[0], 1);
michael@0: assertEq(status, "pass");
michael@0: 
michael@0: function Bag() {}
michael@0: Bag.of = Array.of;
michael@0: Object.defineProperty(Bag.prototype, "0", {set: v => status = "FAIL 2"});
michael@0: assertEq(Bag.of(1)[0], 1);
michael@0: assertEq(status, "pass");