1620   ThreadedList() : head_(nullptr), tail_(&head_) {}  in ThreadedList()
1622     DCHECK_NULL(*tail_);  in Add()
1624     *tail_ = v;  in Add()
1625     tail_ = v->next();  in Add()
1630     tail_ = &head_;  in Clear()
1677   Iterator end() { return Iterator(tail_); }  in end()
1680   ConstIterator end() const { return ConstIterator(tail_); }  in end()
1683     tail_ = reset_point.entry_;  in Rewind()
1684     *tail_ = nullptr;  in Rewind()
1689       DCHECK_NULL(*tail_);  in MoveTail()
1690       *tail_ = *location;  in MoveTail()
1691       tail_ = parent->tail_;  in MoveTail()
1712   T** tail_;  variable