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