anchor.diff:        };
   
         plugins = mkOption {
  -        default = [];
  +        default = [ ];
           type = types.listOf types.str;
           description = "The names of plugins to enable";
         };
   
         pluginDirs = mkOption {
  -        default = [];
  +        default = [ ];
           type = types.listOf types.path;
           description = "The list of directories containing external plugins";
         };
  
positive.code:       };
  
        configItems = mkOption {
          default = {};
          type = types.attrsOf types.str;
          example = literalExample ''
            {
  
negative.code:         RABBITMQ_ENABLED_PLUGINS_FILE = pkgs.writeText "enabled_plugins" ''
            [ ${concatStringsSep "," cfg.plugins} ].
          '';
        } // optionalAttrs (cfg.config != "") { RABBITMQ_ADVANCED_CONFIG_FILE = advanced_config_file; };
  
        serviceConfig = {
          ExecStart = "${cfg.package}/sbin/rabbitmq-server";
  