code: func (c *Callbacks) OnCDOTAUserMsg_DamageReport(fn func(*dota.CDOTAUserMsg_DamageReport) error) {
  	c.onCDOTAUserMsg_DamageReport = append(c.onCDOTAUserMsg_DamageReport, fn)
  }
docs: // OnCDOTAUserMsg_DamageReport registers a callback for EDotaUserMessages_DOTA_UM_DamageReport