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