anchor.diff:        net
       ];
       meta.useUnstable = true;
  -    date = "2018-03-09";
  +    date = "2018-03-16";
     };
   
     open-golang = buildFromGitHub {
  
positive.code: 
    govalidator = buildFromGitHub {
      version = 5;
      rev = "4b3d68f87f176641ffc147420296013aff66ea32";
      owner = "asaskevich";
      repo = "govalidator";
      sha256 = "039pqnk36bgi0qygjcwb226mijy097zv0wyns76yhk55knw70pfm";
      date = "2018-01-15";
    };
  
    goversion = buildFromGitHub {
  
negative.code:     version = 5;
      owner = "libp2p";
      repo = "go-libp2p-circuit";
      date = "2018-03-15";
      rev = "6dc6e9b7982f4e7ecc9277008b071d697dd61adb";
      sha256 = "1l99nap8ms2dpy8025xrcykm0ydg1xxmcyfkfm3g4klhrq8gyk5q";
      propagatedBuildInputs = [
        go-addr-util
        go-log
  