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        A type trait that determines whether a set_done expression is
        well-formed.
      
template<
    typename R>
struct can_set_done
        Class template can_set_done is a trait that is derived from
        true_type if the expression execution::set_done(std::declval<R>(),
        std::declval<E>()) is well formed; otherwise false_type.
      
        Header: boost/asio/execution/set_done.hpp
      
        Convenience header: boost/asio/execution.hpp