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function test() {
Object.defineProperty(Array.prototype, -1, {
set() {
throw new Error("shouldn't get here");
}
});
// A bunch of indices which grow the array.
var indices = [];
for (var i = 0; i < 10_000; ++i) indices.push(i);
// And finally a negative index.
indices.push(-1);
// Plain data properties use DefineDataProperty.
var desc = {value: 0, writable: true, enumerable: true, configurable: true};
var a = [];
for (var i = 0; i < indices.length; ++i) {
Object.defineProperty(a, indices[i], desc);
}
}
test();