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A customisation point that submits a sender to a receiver.
constexpr unspecified submit = unspecified;
        The name execution::submit denotes a customisation point object.
        For some subexpressions s and r, let S
        be a type such that decltype((s)) is S and let
        R be a type such that decltype((r)) is R.
        The expression execution::submit(s, r) is ill-formed if sender_to<S,
        R> is not true. Otherwise, it is expression-equivalent
        to:
      
s.submit(r), if that expression is valid and S
            models sender. If the function selected does not submit
            the receiver object r via the sender s, the
            program is ill-formed with no diagnostic required.
          submit(s, r), if that expression is valid and
            S models sender, with overload resolution performed
            in a context that includes the declaration void submit();
            and that does not include a declaration of execution::submit.
            If the function selected by overload resolution does not submit the receiver
            object r via the sender s, the program is ill-formed
            with no diagnostic required.
          execution::start((new submit_receiver<S, R>{s,r})->state_),
            where submit_receiver is an implementation-defined class
            template equivalent to:
          template<class S, class R>
  struct submit_receiver {
    struct wrap {
      submit_receiver * p_;
      template<class...As>
        requires receiver_of<R, As...>
      void set_value(As&&... as) &&
        noexcept(is_nothrow_receiver_of_v<R, As...>) {
        execution::set_value(std::move(p_->r_), (As&&) as...);
        delete p_;
      }
      template<class E>
        requires receiver<R, E>
      void set_error(E&& e) && noexcept {
        execution::set_error(std::move(p_->r_), (E&&) e);
        delete p_;
      }
      void set_done() && noexcept {
        execution::set_done(std::move(p_->r_));
        delete p_;
      }
    };
    remove_cvref_t<R> r_;
    connect_result_t<S, wrap> state_;
    submit_receiver(S&& s, R&& r)
      : r_((R&&) r)
      , state_(execution::connect((S&&) s, wrap{this})) {}
  };
        Header: boost/asio/execution/submit.hpp
      
        Convenience header: boost/asio/execution.hpp