anchor.diff:  
       let
   
  -      versionModule =
  -        { system.nixosVersionSuffix = lib.optionalString (!officialRelease) versionSuffix;
  -          isoImage.isoBaseName = "nixos-${type}";
  -        };
  -
         config = (import lib/eval-config.nix {
           inherit system;
  -        modules = [ module versionModule ];
  +        modules = [ module versionModule { isoImage.isoBaseName = "nixos-${type}"; } ];
         }).config;
   
         iso = config.system.build.isoImage;
  
positive.code:     with import <nixpkgs> { inherit system; };
  
      let
        versionModule = { system.nixosVersionSuffix = lib.optionalString (!officialRelease) versionSuffix; };
  
        config = (import lib/eval-config.nix {
          inherit system;
  
negative.code:   pkgs = import <nixpkgs> { system = "x86_64-linux"; };
  
  
    versionModule =
      { system.nixosVersionSuffix = pkgs.lib.optionalString (!officialRelease) versionSuffix;  };
  
  
    makeIso =
      { module, type, description ? type, maintainers ? ["eelco"], system }:
  
  