anchor.diff:  
       let
   
  -      version = builtins.readFile ./.version + (lib.optionalString (!officialRelease) versionSuffix);
  -
         versionModule =
  -        { system.nixosVersion = version;
  +        { system.nixosVersion = version + (lib.optionalString (!officialRelease) versionSuffix);
             isoImage.isoBaseName = "nixos-${type}";
           };
   
  
positive.code: 
      with import <nixpkgs> {inherit system;};
      let
        version = builtins.readFile ./.version + (lib.optionalString (!officialRelease) versionSuffix);
  
        versionModule = { system.nixosVersion = version; };
  
        config = (import lib/eval-config.nix {
          inherit system;
  
negative.code: 
  let
  
    version = builtins.readFile ./.version;
    versionSuffix = "pre${toString nixosSrc.rev}-${toString nixpkgs.rev}";
  
  
  