setelem-one-past-nonwritable-length.js

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function f(arr, i, v)

  arr[i] = v;

function test()

  // Use a much-greater capacity than the eventual non-writable length.

  var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];

  Object.defineProperty(a, "length", { writable: false, value: 6 });

  for (var i = 0; i < 100; i++)

    f(a, a.length, i);

  assertEq(a.hasOwnProperty(6), false);

  assertEq(a[6], undefined);

  assertEq(a.length, 6);

test();