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A customisation point that notifies an operation state object to start its associated operation.
constexpr unspecified start = unspecified;
        The name execution::start denotes a customisation point object.
        The expression execution::start(R) for some subexpression R
        is expression-equivalent to:
      
R.start(), if that expression is valid.
          start(R), if that expression is valid, with overload
            resolution performed in a context that includes the declaration void
            start(); and that does not include a declaration of execution::start.
          execution::start(R) is ill-formed.
          
        Header: boost/asio/execution/start.hpp
      
        Convenience header: boost/asio/execution.hpp