anchor.diff:      version = 5;
       owner = "olivere";
       repo = "elastic";
  -    rev = "v5.0.65";
  -    sha256 = "083vhj862k277mr2p71v8pyxbbc2g9mjv4blwm6xz0nhphhjwbyb";
  +    rev = "v5.0.66";
  +    sha256 = "1la8d6aa938rj7b368jp1qn7rmdlqwrf7m1sj4j5h1539prrpgd1";
       goPackagePath = "gopkg.in/olivere/elastic.v5";
       propagatedBuildInputs = [
         errors
  
positive.code:   };
  
    json-patch = buildFromGitHub {
      version = 3;
      owner = "evanphx";
      repo = "json-patch";
      rev = "944e07253867aacae43c04b2e6a239005443f33a";
      date = "2017-07-19";
      sha256 = "0q7zag1ng95a07xrwdw48bqw7dh7ky8frwadbpd85nxwl6fc7z61";
      propagatedBuildInputs = [
        go-flags
      ];
  
negative.code: 
    debug = buildFromGitHub {
      version = 5;
      rev = "6438784c01bf81395200ae924b75d8bdc751f1dc";
      date = "2018-03-14";
      owner = "golang";
      repo = "debug";
      sha256 = "06pdwp3rbgj1bvsqr8rn5js71c1jh1rbi4l56q4hsrm0sy8cji3s";
      goPackagePath = "golang.org/x/debug";
      excludedPackages = "\\(testdata\\)";
    };
  
    exp = buildFromGitHub {
      version = 5;
      rev = "9673cff68816794f1cd927a1e58760e4d41c393b";
      owner = "golang";
      repo = "exp";
      sha256 = "1fys8vgmik9y865ly1s0h7aakm5wh54282mwpbxxz162jwbxn9cd";
      date = "2018-03-14";
      goPackagePath = "golang.org/x/exp";
      subPackages = [
        "ebnf"
  