code: func New(log *syslog.Writer, stdoutLogLevel int, syslogLogLevel int) (Logger, error) {
  	if log == nil {
  		return nil, errors.New("Attempted to use a nil System Logger.")
  	}
  	return &impl{
  		&bothWriter{log, stdoutLogLevel, syslogLogLevel, clock.Default()},
  	}, nil
  }
docs: // New returns a new Logger that uses the given syslog.Writer as a backend.