Method erase_for_next_parse

include/boost/parser/parser.hpp:5314–5322

            matched in the current top-level parse. */
        template<typename Context>
        void erase_for_next_parse(Context const & context, std::string_view str)
        {
            auto & pending_ops =
                detail::get_pending_symtab_ops(context, ref());
            pending_ops.push_back(detail::symbol_table_operation<T>{
                std::string(str),
                std::nullopt,
                detail::symbol_table_op::erase});
        }

        /** Erases all the entries from the copy of the symbol table inside
            the parse context `context`. */