anchor.diff:  
           notifier = mkOption {
             default = null;
  -          example = literalExample ''
  -            "${pkgs.libnotify}/bin/notify-send \"Locking in 10 seconds\""
  -          '';
  -          type = types.nullOr types.string;
  +          example = "${pkgs.libnotify}/bin/notify-send \"Locking in 10 seconds\"";
  +          type = types.nullOr types.str;
   
             description = ''
               Notification script to be used to warn about the pending autolock.
  
positive.code:           assertion = cfg.killer != null -> cfg.killtime >= 10;
            message = "killtime has to be at least 10 minutes according to `man xautolock`";
          }
        ];
      };
    }
  
negative.code: 
          nowlocker = mkOption {
            default = null;
            example = "${pkgs.i3lock}/bin/i3lock -i /path/to/img";
            type = types.nullOr types.str;
  
            description = ''
              The script to use when manually locking the computer with <command>xautolock -locknow</command>.
  