code: func (c *Callbacks) OnCDOTAUserMsg_WorldLine(fn func(*dota.CDOTAUserMsg_WorldLine) error) {
  	c.onCDOTAUserMsg_WorldLine = append(c.onCDOTAUserMsg_WorldLine, fn)
  }
docs: // OnCDOTAUserMsg_WorldLine registers a callback for EDotaUserMessages_DOTA_UM_WorldLine