Function tie_aggregate

include/boost/parser/tuple.hpp:269–273

        template<typename T>
        constexpr auto tie_aggregate(T & x)
        {
            static_assert(!std::is_union_v<T>);
            return tie_aggregate_impl<struct_arity_v<T>>::call(x);
        }

        template<typename Tuple, typename Tie, int... Is>
        auto aggregate_to_tuple(