anchor.diff:        inherit
           goPackagePath
           rev;
  -      date = "2017-08-29";
  +      date = "2017-09-03";
       };
  -    rev = "e0e0e6e500066ff47335c7717e2a090ad127adec";
  +    rev = "389ac18434a93e8455f6f546845de20c5858f22f";
       goPackagePath = "google.golang.org/api";
       src = fetchzip {
         version = 3;
  
positive.code: 
    go-github = buildFromGitHub {
      version = 3;
      date = "2017-08-27";
      rev = "d3b18a99b5c5056e1828984d62b2fb4cf6349073";
      owner = "google";
      repo = "go-github";
      sha256 = "1yl3bhg3vzizv4jv3cwwq3capzh1kjaqpv9fx895kng4v1l5q51v";
      buildInputs = [
        appengine
        oauth2
  
negative.code: 
    mongo-tools = buildFromGitHub {
      version = 3;
      rev = "802850c8b6b596918fff6f41aacaef3cb02ca35d";
      owner  = "mongodb";
      repo   = "mongo-tools";
      sha256 = "0a28b5rlc172fskkc0iqczlf2cw15rgrzkkvq5rxpp4d5kqrh910";
      buildInputs = [
        crypto
        escaper
  