u += 1<<13 - 1                  // add almost a page

	for i := 0; i < 1000000; i++ {
		_ = identity(u)         // installs u at return slot
		_ = liveReturnSlot(nil) // incorrectly marks return slot as live
	}
}

//go:noinline
func liveReturnSlot(x *int) *int {
	defer func() {}() // causes return slot to be marked live
	sink = &x         // causes x to be moved to the heap, triggering allocation
	return x
}