25   char_.clear();  in clear()
35   char_.resize(nextStart_);  in pop_back()
41   char_.shrink_to_fit();  in shrink_to_fit()
48   char_.swap(that.char_);  in swap()
88   if (nextStart_ < char_.size()) {  in Put()
91   int offset = char_.size();  in Put()
95   char_.insert(char_.end(), that.char_.begin(), that.char_.end());  in Put()
96   nextStart_ = char_.size();  in Put()
151   std::size_t chars{char_.size()};  in ToLowerCase()
155     char *p{&char_[j]};  in ToLowerCase()
156     char const *limit{char_.data() + nextStart};  in ToLowerCase()
267   cooked.Put(&char_[0], char_.size());  in Emit()
272   o << "TokenSequence has " << char_.size() << " chars; nextStart_ "  in Dump()