code: func Mentions(
  	bot reddit.Bot,
  	kill <-chan bool,
  	errs chan<- error,
  ) (
  	<-chan *reddit.Message,
  	error,
  ) {
  	return inboxStream(bot, kill, errs, "mentions")
  }
docs: // Mentions returns a stream of mentions of the bot's username anywhere on
  // Reddit. It consumes one interval of the handle. Note, that a username mention
  // which can reach the inbox in any other way (as a pm, or a reply), will not
  // come through the mention stream because Reddit labels it differently.