michael@0: function f(arr, i, v)
michael@0: {
michael@0:   arr[i] = v;
michael@0: }
michael@0: 
michael@0: function test()
michael@0: {
michael@0:   // Use a much-greater capacity than the eventual non-writable length.
michael@0:   var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
michael@0:   Object.defineProperty(a, "length", { writable: false, value: 6 });
michael@0: 
michael@0:   for (var i = 0; i < 100; i++)
michael@0:     f(a, a.length, i);
michael@0: 
michael@0:   assertEq(a.hasOwnProperty(6), false);
michael@0:   assertEq(a[6], undefined);
michael@0:   assertEq(a.length, 6);
michael@0: }
michael@0: 
michael@0: test();