anchor.diff:        { uid = config.ids.uids.tomcat;
           description = "Tomcat user";
           home = "/homeless-shelter";
  +        group = "tomcat";
           extraGroups = cfg.extraGroups;
         };
   
  
positive.code:       webapps = mkOption {
          type = types.listOf types.path;
          default = [ tomcat.webapps ];
          defaultText = literalExpression "[ pkgs.tomcat85.webapps ]";
          description = "List containing WAR files or directories with WAR files which are web applications to be deployed on Tomcat";
        };
  
  
negative.code: 
        package = mkOption {
          type = types.package;
          default = pkgs.tomcat9;
          defaultText = literalExpression "pkgs.tomcat9";
          example = lib.literalExpression "pkgs.tomcat9";
          description = ''
            Which tomcat package to use.
  