push-densely-nonwritable-length.js

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function f(arr, v)

  arr.push(v);

function basic(out)

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

  var a = out.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 });

  f(a, 99);

var obj = {};

var a;

try

  basic(obj);

  throw new Error("didn't throw!");

catch (e)

  assertEq(e instanceof TypeError, true, "expected TypeError, got " + e);

  a = obj.a;

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

  assertEq(a[6], undefined);

  assertEq(a.length, 6);