anchor.diff:    };
   
     memberlist = buildFromGitHub {
  -    version = 1;
  -    date = "2016-08-12";
  -    rev = "0c5ba075f8520c65572f001331a1a43b756e01d7";
  +    version = 2;
  +    date = "2016-09-15";
  +    rev = "7ad712f5f34ec40aebe6ca47756d07898486a8d2";
       owner = "hashicorp";
       repo = "memberlist";
  -    sha256 = "0v03pwcx5sjs238zyfbgf6way0wj3nvniq2hvbc36aybxmby4qqa";
  +    sha256 = "055rbkg9p3hvi5dkvj3xb7ibnp3ry7j0rkylcg7gplszbhqv16sd";
       propagatedBuildInputs = [
         dns
         ugorji_go
  
positive.code: 
    grpc = buildFromGitHub {
      version = 2;
      rev = "3e1c91c1e0a72a34f68542bc029792b031835cbf";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "0zm4jf04gqdf4m97y0h3gz1fn0smmabfn6b3nhkhifazyfpwgzcf";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [ "github.com/grpc/grpc-go" ];
      propagatedBuildInputs = [ http2 net protobuf oauth2 glog ];
      excludedPackages = "\\(test\\|benchmark\\)";
      meta.useUnstable = true;
      date = "2016-09-12";
    };
  
    gucumber = buildFromGitHub {
  
negative.code:   };
  
    hcl = buildFromGitHub {
      version = 2;
      date = "2016-09-02";
      rev = "99df0eb941dd8ddbc83d3f3605a34f6a686ac85e";
      owner  = "hashicorp";
      repo   = "hcl";
      sha256 = "1cc2q2ka7rxx5di26zl5i8nrv98zgbv3wk4z0wrlr3ssswqx3jis";
    };
  
    hil = buildFromGitHub {
      version = 1;
      date = "2016-09-09";
      rev = "35665ca835864c6c0b5495eb38241cde3e2cff7f";
      owner  = "hashicorp";
      repo   = "hil";
      sha256 = "525aed97f2bd22f9c4dd56c9beaae1b296a3d6864faf306c6a60ce7b3c5bf009";
      propagatedBuildInputs = [
        mapstructure
        reflectwalk
  