func (rs *Rows) Scan(dest ...interface{}) error {
  3022  	rs.closemu.RLock()
  3023  
  3024  	if rs.lasterr != nil && rs.lasterr != io.EOF {
  3025  		rs.closemu.RUnlock()
  3026  		return rs.lasterr
  3027  	}
  3028  	if rs.closed {
  3029  		err := rs.lasterrOrErrLocked(errRowsClosed)
  3030  		rs.closemu.RUnlock()
  3031  		return err
  3032  	}
  3033  	rs.closemu.RUnlock()
  3034  
  3035  	if rs.lastcols == nil {
  3036  		return errors.New("sql: Scan called without calling Next")
  3037  	}
  3038  	if len(dest) != len(rs.lastcols) {
  3039  		return fmt.Errorf("sql: expected %d destination arguments in Scan, not %d", len(rs.lastcols), len(dest))
  3040  	}
  3041  	for i, sv := range rs.lastcols {
  3042  		err := convertAssignRows(dest[i], sv, rs)
  3043  		if err != nil {
  3044  			return fmt.Errorf(`sql: Scan error on column index %d, name %q: %v`, i, rs.rowsi.Columns()[i], err)
  3045  		}
  3046  	}
  3047  	return nil
  3048  }