anchor.diff:      date = "2014-07-04";
     };
   
  +  go-sockaddr = buildFromGitHub {
  +    version = 2;
  +    rev = "c97459b5a66774ed49deb0cc739f035fb7860bcf";
  +    owner  = "hashicorp";
  +    repo   = "go-sockaddr";
  +    sha256 = "13p98glbz0xaxs4i55fln0c71sazaxh0f5hnir2zr3z0sjmdxs7s";
  +    date = "2016-12-03";
  +    propagatedBuildInputs = [
  +      mitchellh_cli
  +      columnize
  +      errwrap
  +      go-wordwrap
  +    ];
  +  };
  +
     go-spew = buildFromGitHub {
       version = 2;
       rev = "v1.1.0";
  
positive.code:     repo   = "go-version";
      sha256 = "13jrvfmg7vx1zzsjbwyfaxh06y8si7f9drcpy0400pv9fv9fxfs7";
      date = "2016-10-31";
    };
  
    go-zookeeper = buildFromGitHub {
  
negative.code: 
    docker = buildFromGitHub {
      version = 2;
      rev = "2cf32ee04360add15b4431ba55032824ac089349";
      owner = "docker";
      repo = "docker";
      sha256 = "1rl77qxvnvkvg0ajv6swx02602pf6gwqdppkp1i9ka9ba3lfzj4a";
      meta.useUnstable = true;
      date = "2016-12-20";
    };
  
    docker_for_runc = buildFromGitHub {
  