michael@0: 
michael@0: x = []
michael@0: Object.defineProperty(x, 4, {
michael@0:     configurable: true
michael@0: })
michael@0: Array.prototype.pop.call(x)
michael@0: for (let y = 0; y < 9; ++y) {
michael@0:     Object.defineProperty(x, 7, {
michael@0:         configurable: true,
michael@0:         enumerable: (y != 2),
michael@0:         writable: true
michael@0:     })
michael@0: }