anchor.diff:            tests.nix-copy-closure
             tests.binaryTarball
             #tests.evalNixpkgs
  -          tests.evalNixOS
  +          #tests.evalNixOS
             installerScript
           ];
       };
  
positive.code: 
            touch $out
          '';
  
  
      installerScript =
  
negative.code:         nix = build.x86_64-linux;
          officialRelease = false;
        };
  
      tests.evalNixOS =
        pkgs.runCommand "eval-nixos" { buildInputs = [ build.x86_64-linux ]; }
  