Method insert

include/boost/parser/parser.hpp:6215–6218

            inside the parse context `context`. */
        template<typename Context>
        void insert(Context const & context, std::string_view str, T x) const
        {
            this->parser_.insert(context, str, std::move(x));
        }

        /** Erases the entry whose UTF-8 match string is `str` from the copy
            of the symbol table inside the parse context `context`. */