return
		}
	}
	hint.next = nil
}

// MapNextArenaHint reserves a page at the next arena growth hint,
// preventing the arena from growing there, and returns the range of
// addresses that are no longer viable.
//
// This may fail to reserve memory. If it fails, it still returns the
// address range it attempted to reserve.
func MapNextArenaHint() (start, end uintptr, ok bool) {
	hint := mheap_.arenaHints