code: func IsChannelNameLiteral(channel string) bool {
  	for i := 0; i < len(channel); i++ {
  		if channel[i] == pwc || channel[i] == fwc {
  			return false
  		}
  	}
  	return true
  }
docs: // IsChannelNameLiteral returns true if the channel name is a literal (that is,
  // it does not contain any wildcard).
  // The channel name is assumed to be valid.