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Move-assign
          a serial_port
          from another.
        
serial_port & operator=(
    serial_port && other);
This assignment operator moves a serial port from one object to another.
                The other serial_port
                object from which the move will occur.
              
          Following the move, the moved-from object is in the same state as if constructed
          using the serial_port(io_context&) constructor.