anchor.diff:    preConfigure = "cd dev";
     enableParallelBuilding = true;
   
  -  passthru.tests = {
  -    can-run-hello-world = callPackage ./test-can-run-hello-world.nix {};
  +  passthru = {
  +    tests.can-run-hello-world = callPackage ./test-can-run-hello-world.nix {};
  +    updateScript = unstableGitUpdater { };
     };
   
     meta = with stdenv.lib; {
  
positive.code: { stdenv
  , fetchFromGitHub
  , cmake
  , callPackage
  
  
negative.code:     platforms = platforms.all;
    };
  }
  