Method CopyWasUsed

util/thread/lfqueue.h:138–142

            EraseList(Copy);
        }
        void CopyWasUsed() {
            Copy = nullptr;
            Tail = nullptr;
            PrevFirst = nullptr;
        }
        void DoCopy(TListNode* ptr) {
            TListNode* newFirst = ptr;
            TListNode* newCopy = nullptr;