anchor.diff:  
     teleport = buildFromGitHub {
       version = 3;
  -    rev = "v2.3.2";
  +    rev = "v2.3.5";
       owner = "gravitational";
       repo = "teleport";
  -    sha256 = "7ee600d525cbda4893b33556ffa44a92bffe1f2f7a9b6fd6a5ccd5422ab63f58";
  +    sha256 = "7f8aa8819d26d371aa75aee0074580334dc6c517aae45021ffc487384e5692a9";
       nativeBuildInputs = [
         pkgs.protobuf-cpp
         protobuf.bin
  
positive.code:     repo = "toml";
      rev = "v0.3.0";
      sha256 = "1cnryizxrj7si27knhh83dd03abw5r0yhac2vmv861inpl3lflx2";
      goPackageAliases = [ "github.com/burntsushi/toml" ];
    };
  
    trace = buildFromGitHub {
  
negative.code:   go-oidc = buildFromGitHub {
      version = 3;
      date = "2017-10-26";
      rev = "a93f71fdfe73d2c0f5413c0565eea0af6523a6df";
      owner  = "coreos";
      repo   = "go-oidc";
      sha256 = "e0370707f20d97f6e8a447de6a6b29564a75cb8a6bd3d8cc992d9996e8b9c78e";
      propagatedBuildInputs = [
        cachecontrol
        clockwork
        go-jose_v2
        oauth2
        pkg
      ];
      meta.autoUpdate = false;
      excludedPackages = "example";
    };
  
    go-okta = buildFromGitHub {
  