Function callback_skip_parse_impl

include/boost/parser/parser.hpp:2695–2737

            typename ErrorHandler,
            typename Callbacks>
        bool callback_skip_parse_impl(
            Iter & first,
            Sentinel last,
            Parser const & parser,
            SkipParser const & skip,
            ErrorHandler const & error_handler,
            Callbacks const & callbacks)
        {
            auto const initial_first = first;
            bool success = true;
            int trace_indent = 0;
            detail::symbol_table_tries_t symbol_table_tries;
            pending_symbol_table_operations_t pending_symbol_table_operations;
            scoped_apply_pending_symbol_table_operations apply_pending(
                pending_symbol_table_operations);
            auto context = detail::make_context<Debug, true>(
                first,
                last,
                success,
                trace_indent,
                error_handler,
                callbacks,
                parser.globals_,
                symbol_table_tries,
                pending_symbol_table_operations);
            auto const flags =
                Debug ? detail::enable_trace(detail::default_flags())
                      : detail::default_flags();
            detail::skip(first, last, skip, flags);
            try {
                parser(first, last, context, skip, flags, success);
                detail::skip(first, last, skip, flags);
                if (Debug)
                    detail::final_trace(context, flags, nope{});
                return success;
            } catch (parse_error<Iter> const & e) {
                if (error_handler(initial_first, last, e) ==
                    error_handler_result::rethrow) {
                    throw;
                }
                return false;
            }
        }

        template<typename R>
        constexpr auto make_input_subrange(R && r) noexcept