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