anchor.diff:      propagatedBuildInputs = [
         net
         sys
  +    ];
  +  };
  +
  +  gophercloud = buildFromGitHub {
  +    version = 3;
  +    rev = "8c5c0c21b452d5d9faf056bbdf5bd59333097c6a";
  +    owner = "gophercloud";
  +    repo = "gophercloud";
  +    sha256 = "00ffif7748wib616vrqycn6v765nl9v0c45n6dcxk38yjh3vfi1l";
  +    date = "2017-10-03";
  +    excludedPackages = "test";
  +    propagatedBuildInputs = [
  +      crypto
  +      yaml_v2
       ];
     };
   
  
positive.code:     date = "2017-09-19";
      rev = "9ac6cf4d929b2fa8fd2d2e6dec5bb0feb4f4911d";
      sha256 = "1v2sjbgcnip3j1fx05wp73xcw0j8h6p6nwwy5mbc297yklyycvi7";
    };
  
    httprouter = buildFromGitHub {
  
negative.code:     sha256 = "1mzn45p24qn7qdagfb9mlj96jlmwk3kgk637kxnb4qaqnl8bkkh1";
    };
  
    gnostic = buildFromGitHub {
      version = 3;
      rev = "v0.1.0";
      owner = "googleapis";
      repo = "gnostic";
      sha256 = "0maql4kfc6q303lxz7pldjbh3k65pkw9yczxsg7285srmf7yp5s6";
      excludedPackages = "tools";
      propagatedBuildInputs = [
        docopt-go
        protobuf
        yaml_v2
      ];
    };
  
    json-iterator_go = buildFromGitHub {
      version = 3;
      rev = "1.0.2";
  