func (c *nvcConn) CheckNamedValue(nv *driver.NamedValue) error {
	if c.skipNamedValueCheck {
		return driver.ErrSkip
	}
	switch v := nv.Value.(type) {
	default:
		return driver.ErrSkip
	case Out:
		switch ov := v.Dest.(type) {
		default:
			return errors.New("unknown NameValueCheck OUTPUT type")
		case *string:
			*ov = "from-server"
			nv.Value = "OUT:*string"
		}
		return nil