anchor.diff:    jobs = {
   
       bootstrap1 = bootstrap baseline 1;
  -    bootstrap2 = bootstrap jobs.bootstrap1 2;
  -    bootstrap3 = bootstrap jobs.bootstrap2 3;
  -    test-compiler = test jobs.bootstrap3 "test-compiler";
  -    test-interpreter = test jobs.bootstrap3 "test-interpreter";
  +    #bootstrap2 = bootstrap jobs.bootstrap1 2;
  +    #bootstrap3 = bootstrap jobs.bootstrap2 3;
  +    #test-compiler = test jobs.bootstrap3 "test-compiler";
  +    #test-interpreter = test jobs.bootstrap3 "test-interpreter";
     };
   in
     jobs
  
positive.code:         mkdir -p strategoxt/syntax/java-front
          cp -Rv ${javaFront}/* strategoxt/syntax/java-front/
          chmod -R a+w strategoxt/syntax/java-front
          mkdir baseline
          cd baseline
          cp ${baseline} .
          tar -xf ${baseline} .
          cd ../..
        '';
  
        antTargets = ["all" "install"] ++ (pkgs.lib.optional (nr == 3) "test-compiler");
        antProperties = [
          { name = "revision"; value = "${toString strategoxtJava.rev}"; }
          { name = "sdf2bundle"; value = pkgs.strategoPackages.sdf; }
          { name = "install-prefix-out"; value = "$out"; }
        ] ;
        antBuildInputs = [ pkgs.ecj baseline] ;
  
        ANT_OPTS="-Xss8m -Xmx1024m";
  
  
negative.code: { nixpkgs ? ../../nixpkgs
  , javaFront ? { outPath = ../../java-front ; rev = 1234; }
  , strategoxtJava ? { outPath = ../../strategoxt ; rev = 1234; }
  , baselineTarball ? ../../strategoxt-distrib.tar
  } :
  let
    pkgs = import nixpkgs {};
  
    baselineTarball = pkgs.fetchurl {
      url = https://github.com/metaborg/strategoxt/releases/download/baseline-2/strategoxt-distrib.tar;
      sha256 = "545e14a2ae302f96a35b95683ffb1915d4bbaa48e112f552d8469a97f40877e3";
    };
    
    baseline = pkgs.stdenv.mkDerivation {
        name = "strategoxt-baseline";
  
  
        buildInputs = with pkgs; [ ];
  
        buildCommand = ''
          ensureDir $out
          cd $out
          tar -xf ${baselineTarball}
        '';
    };
  
    bootstrap = baseline: nr:
      pkgs.releaseTools.antBuild {
        name = "strategoxt-java-${toString nr}";
        src = strategoxtJava;
        buildInputs = with pkgs; [ strategoPackages.sdf openjdk ];
  
        preConfigure = ''
          cd strategoxt
  