code: func (c *Callbacks) OnCSVCMsg_Prefetch(fn func(*dota.CSVCMsg_Prefetch) error) {
  	c.onCSVCMsg_Prefetch = append(c.onCSVCMsg_Prefetch, fn)
  }
docs: // OnCSVCMsg_Prefetch registers a callback for SVC_Messages_svc_Prefetch