79   bool empty() const { return nodes_.empty(); }  in empty()
80   size_t size() const { return nodes_.size(); }  in size()
81   Node* NodeAt(size_t index) { return nodes_[index]; }  in NodeAt()
82   size_t NodeCount() const { return nodes_.size(); }  in NodeCount()
84   value_type& front() { return nodes_.front(); }  in front()
85   value_type const& front() const { return nodes_.front(); }  in front()
88   iterator begin() { return nodes_.begin(); }  in begin()
89   iterator end() { return nodes_.end(); }  in end()
92   const_iterator begin() const { return nodes_.begin(); }  in begin()
93   const_iterator end() const { return nodes_.end(); }  in end()
96   reverse_iterator rbegin() { return nodes_.rbegin(); }  in rbegin()
97   reverse_iterator rend() { return nodes_.rend(); }  in rend()
103     nodes_.insert(insertion_point, insertion_start, insertion_end);  in InsertNodes()
163   NodeVector nodes_;         // nodes of this block in forward order.  variable