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            (Deprecated: Use expires_after().) Set the stream's expiry
            time relative to now.
          
void expires_from_now(
    const duration & expiry_time);
            This function sets the expiry time associated with the stream. Stream
            operations performed after this time (where the operations cannot be
            completed using the internal buffers) will fail with the error boost::asio::error::operation_aborted.
          
The expiry time to be used for the timer.