anchor.diff:    boulder = let
       owner = "letsencrypt";
       repo = "boulder";
  -    rev = "9866abab8962a591f06db457a4b84c518cc88243";
  -    version = "20170510";
  +    rev = "9c6a1f2adc4c26d925588f5ae366cfd4efb7813a";
  +    version = "20180129";
   
     in pkgs.buildGoPackage rec {
       name = "${repo}-${version}";
  
positive.code:       cat "${snakeOilCa}/ca.key" > test/test-ca.key
        cat "${snakeOilCa}/ca.pem" > test/test-ca.pem
      '';
  
      goPackagePath = "github.com/${owner}/${repo}";
      buildInputs = [ pkgs.libtool ];
  
negative.code:     src = pkgs.fetchFromGitHub {
        name = "${name}-src";
        inherit rev owner repo;
        sha256 = "09kszswrifm9rc6idfaq0p1mz5w21as2qbc8gd5pphrq9cf9pn55";
      };
  
      postPatch = ''
  