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