anchor.diff:      version = 3;
       owner = "denverdino";
       repo = "aliyungo";
  -    rev = "cb2da2ef639fc7c48295e9b695b607be41700b41";
  -    date = "2017-11-27";
  -    sha256 = "09i4v2qkwgkfciwn71ajh1nxvsscm6i06pynkc07kvrpna234lrb";
  +    rev = "1992eac5c9e1b63e92cdf6d9dcddbcf5809647ae";
  +    date = "2017-11-30";
  +    sha256 = "0341pxy7qj8c4xkvhvzjq126ahkvh07ad2n7hsy7idlgbgvqyzly";
       propagatedBuildInputs = [
         protobuf
       ];
  
positive.code:       inherit
          goPackagePath
          rev;
        date = "2017-11-25";
      };
      rev = "b804618854e387dc7fdd9e50496183ddcbb4b120";
      goPackagePath = "google.golang.org/api";
      src = fetchzip {
        version = 3;
  
negative.code: 
    go-systemd = buildFromGitHub {
      version = 3;
      rev = "c966a8af8422394b2e370d90e2101adba21c14be";
      owner = "coreos";
      repo = "go-systemd";
      sha256 = "08rk040k22ymd5z7bm9l534yyfsgza0dp41vivj826ch6dzndrb2";
      propagatedBuildInputs = [
        dbus
        pkg
        pkgs.systemd_lib
      ];
      date = "2017-11-30";
    };
  
    go-systemd_journal = buildFromGitHub {
  