anchor.diff:      version = 6;
       owner = "sbinet";
       repo = "go-python";
  -    date = "2018-08-07";
  -    rev = "17c9f530692bb11c325ea8f7d0917ad6cdac88b3";
  -    sha256 = "DyfuD71nlERTV75vBwb/hQFm4Tc3s6PpPdt1yKU0sjE=";
  +    date = "2018-03-27";
  +    rev = "f976f61134dc6f5b4920941eb1b0e7cec7e4ef4c";
  +    sha256 = "1x61ra7kmi7gp9z6n6x9flavhnwbqzpav5wk9ai98ray9q2xy49w";
       propagatedBuildInputs = [
         pkgs.python2Packages.python
       ];
  
positive.code:     version = 6;
      owner = "go-retry";
      repo = "retry";
      rev = "v1.0.2";
      sha256 = "DkRnSjyO4CHJqEVtIAtjWp/MVwPVtqrsgGqHaAZuJ88=";
      goPackagePath = "gopkg.in/retry.v1";
    };
  
  
negative.code: 
    debug = buildFromGitHub {
      version = 6;
      rev = "bd051a4465ee878585905cd46ae1ce5b96d132c7";
      date = "2018-07-09";
      owner = "golang";
      repo = "debug";
      sha256 = "0xx3d6nip92gdjg9gqszj2m3yip4bf9qfxbz5v0a6xn67faq3l1v";
      goPackagePath = "golang.org/x/debug";
      excludedPackages = "\\(testdata\\)";
      propagatedBuildInputs = [
  