code: func (c *Callbacks) OnCUserMessageCloseCaptionPlaceholder(fn func(*dota.CUserMessageCloseCaptionPlaceholder) error) {
  	c.onCUserMessageCloseCaptionPlaceholder = append(c.onCUserMessageCloseCaptionPlaceholder, fn)
  }
docs: // OnCUserMessageCloseCaptionPlaceholder registers a callback for EBaseUserMessages_UM_CloseCaptionPlaceholder