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A customisation point that delivers a value to a receiver.
constexpr unspecified set_value = unspecified;
        The name execution::set_value denotes a customisation point
        object. The expression execution::set_value(R, Vs...) for some
        subexpressions R and Vs... is expression-equivalent
        to:
      
R.set_value(Vs...), if that expression is valid. If the
            function selected does not send the value(s) Vs... to the
            receiver R's value channel, the program is ill-formed with
            no diagnostic required.
          set_value(R, Vs...), if that expression is valid,
            with overload resolution performed in a context that includes the declaration
            void set_value(); and that does not include a declaration
            of execution::set_value. If the function selected by overload
            resolution does not send the value(s) Vs... to the receiver
            R's value channel, the program is ill-formed with no diagnostic
            required.
          execution::set_value(R, Vs...) is ill-formed.
          
        Header: boost/asio/execution/set_value.hpp
      
        Convenience header: boost/asio/execution.hpp