anchor.diff:  
     goorgeous = buildFromGitHub {
       version = 3;
  -    rev = "16f200711ca25290fa82178ce651f31f0fea17d8";
  -    date = "2017-08-15";
  +    rev = "098da33fde5f9220736531b3cb26a2dec86a8367";
  +    date = "2017-09-01";
       owner = "chaseadamsio";
       repo = "goorgeous";
  -    sha256 = "0cx69h3jgfwynhhkizkg2da8xj64i2q5qnr1hiv13jz3wzc8582r";
  +    sha256 = "0w80lfxsz48n78wng28xzgva2i9bsd8fcvgcajjva6gw63ywsy6x";
       propagatedBuildInputs = [
         blackfriday
         sanitized-anchor-name
  
positive.code: 
    gax-go = buildFromGitHub {
      version = 3;
      date = "2017-08-24";
      rev = "2cadd475a3e966ec9b77a21afc530dbacec6d613";
      owner  = "googleapis";
      repo   = "gax-go";
      sha256 = "17zqwqylrfs30830vz8zy7qyx5ak799mgvdwf2xs18cw0dgwdxyw";
      propagatedBuildInputs = [
        grpc_for_gax-go
        net
  
negative.code: 
    go-floodsub = buildFromGitHub {
      version = 3;
      rev = "b93dd9968aed902f1c190710a4ed0879f2a1071a";
      owner  = "libp2p";
      repo   = "go-floodsub";
      sha256 = "0w6c1nrbr18y1iikbg6gwln19vqq7hxw3v6fv35isdbq3i2filai";
      date = "2017-08-29";
      propagatedBuildInputs = [
        gogo_protobuf
        go-libp2p-host
  