anchor.diff:  
           # Swap devices.
           ${flip concatMapStrings config.swapDevices (sw:
  -            "${sw.realDevice} none swap${prioOption sw.priority}\n"
  +            "${sw.realDevice} none swap ${swapOptions sw}\n"
           )}
         '';
   
  
positive.code:         skipCheck = fs: fs.noCheck || fs.device == "none" || builtins.elem fs.fsType fsToSkipCheck;
          # https://wiki.archlinux.org/index.php/fstab#Filepath_spaces
          escape = string: builtins.replaceStrings [ " " "\t" ] [ "\\040" "\\011" ] string;
        in ''
          # This is a generated file.  Do not edit!
          #
  
negative.code:                      # anyway so that other modules could check
                       # their assertions too
                       (attrValues config.fileSystems);
  
    specialFSTypes = [ "proc" "sysfs" "tmpfs" "ramfs" "devtmpfs" "devpts" ];
  
  