Method query

include/exec/asio/completion_token.hpp:494–497

          asio_impl::query(std::declval<Executor const &>(), std::declval<Query const &>());
        }
      constexpr decltype(auto) query(Query const & q) const noexcept
      {
        return asio_impl::query(ex_, q);
      }

      template <typename... Args>
        requires requires {