anchor.diff:  }:
   
   let
  -  inherit (pkgs.lib) concatMapStrings listToAttrs;
  +  inherit (pkgs.lib) concatMapStrings listToAttrs optionals optionalString;
     inherit (import ../lib/testing-python.nix { inherit system pkgs; }) makeTest;
   
     hello32 = "${pkgs.pkgsCross.mingw32.hello}/bin/hello.exe";
  
positive.code: 
        machine = { pkgs, ... }: {
          environment.systemPackages = [ pkgs."${packageSet}"."${variant}" ];
          virtualisation.diskSize = "800";
        };
  
        testScript = ''
  
negative.code: 
    variants = [ "base" "full" "minimal" "staging" "unstable" ];
  
  in
  listToAttrs (
    map (makeWineTest "winePackages" [ hello32 ]) variants
    ++ optionals pkgs.stdenv.is64bit
      (map (makeWineTest "wineWowPackages" [ hello32 hello64 ]) variants)
  )
  