anchor.diff:          RABBITMQ_ENABLED_PLUGINS_FILE = pkgs.writeText "enabled_plugins" ''
             [ ${concatStringsSep "," cfg.plugins} ].
           '';
  -      } //  optionalAttrs (cfg.config != "") { RABBITMQ_ADVANCED_CONFIG_FILE = advanced_config_file; };
  +      } // optionalAttrs (cfg.config != "") { RABBITMQ_ADVANCED_CONFIG_FILE = advanced_config_file; };
   
         serviceConfig = {
           ExecStart = "${cfg.package}/sbin/rabbitmq-server";
  
positive.code: 
    inherit (builtins) concatStringsSep;
  
    config_file_content = lib.generators.toKeyValue {} cfg.configItems;
    config_file = pkgs.writeText "rabbitmq.conf" config_file_content;
  
    advanced_config_file = pkgs.writeText "advanced.config" cfg.config;
  
  in {
    ###### interface
    options = {
      services.rabbitmq = {
  
negative.code:       };
  
        plugins = mkOption {
          default = [ ];
          type = types.listOf types.str;
          description = "The names of plugins to enable";
        };
  
        pluginDirs = mkOption {
          default = [ ];
          type = types.listOf types.path;
          description = "The list of directories containing external plugins";
        };
  