test/mjsunit/regress/regress-842.js

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// 842 describes a scenario where Object.prototype or Array.prototype is
// changed (a property is added) after which freeze and seal would fail
// since that property would be listed when doing a "for (var key in names)"

Array.prototype.myfunc = function() {};
Array.prototype[10] = 42;
Array.prototype.length = 3000;

var obj = { name: "n1" };

try {
  obj = Object.freeze(obj);
} catch (e) {
  assertUnreachable();
}