anchor.diff:  let
   
   ###### interface
  +  inherit (pkgs.lib) mkOption types;
   
     options = {
   
  -    fileSystems = pkgs.lib.mkOption {
  +    fileSystems = mkOption {
         example = [
           { mountPoint = "/";
             device = "/dev/hda1";
  
positive.code:         <literal>autocreate</literal> forces <literal>mountPoint</literal> to be created with 
          <command>mkdir -p</command> .
        ";
      };
    
      system.sbin.mount = pkgs.lib.mkOption {
        internal = true;
        default = pkgs.utillinuxng.override {
          buildMountOnly = true;
  
negative.code:   inherit (pkgs) e2fsprogs;
    fileSystems = config.fileSystems;
    mountPoints = map (fs: fs.mountPoint) fileSystems;
    devices = map (fs: if fs.device != null then fs.device else "LABEL=" + fs.label) fileSystems;
    fsTypes = map (fs: fs.fsType) fileSystems;
    optionss = map (fs: fs.options) fileSystems;
    autocreates = map (fs: fs.autocreate) fileSystems;
    mount = config.system.sbin.mount;
  
    job = ''
  