// Clone should make a copy of as, since it is in the arena.
	asCopy := UserArenaClone(as)
	if unsafe.StringData(as) == unsafe.StringData(asCopy) {
		t.Error("Clone did not make a copy")
	}

	// Clone should make a copy of subAs, since subAs is just part of as and so is in the arena.
	subAs := as[1:3]
	subAsCopy := UserArenaClone(subAs)
	if unsafe.StringData(subAs) == unsafe.StringData(subAsCopy) {

	systemstack(func() {
		lock(&mheap_.lock)
		for s := mheap_.userArena.quarantineList.first; s != nil; s = s.next {
			n++
		}
		unlock(&mheap_.lock)
	})
	return n
}

func UserArenaClone[T any](s T) T {
	return arena_heapify(s).(T)
}

var AlignUp = alignUp

func BlockUntilEmptyFinalizerQueue(timeout int64) bool {
	return blockUntilEmptyFinalizerQueue(timeout)
}