anchor.diff:      version = 2;
       owner = "grafana";
       repo = "grafana";
  -    rev = "v4.0.0";
  -    sha256 = "1sqphifwzzx46kyy4j8kf4m7vr2i9v1qn7r55cgs1bl8ysa15lah";
  +    rev = "v4.0.1";
  +    sha256 = "1jnh0szbkpb6j8sfc4y4f6r3vlqdhrl90b1l96qc9r70z0n2xhxa";
       buildInputs = [
         amqp
         aws-sdk-go
  
positive.code: 
    grpc = buildFromGitHub {
      version = 2;
      rev = "c7bdf3912d878994614eb32b7b96158f227417a7";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "0gpvgnn29qm066dprx3qgbhwrix200cyxjjjclaf0b90pjq6idpj";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [ "github.com/grpc/grpc-go" ];
      propagatedBuildInputs = [ http2 net protobuf oauth2 glog ];
      excludedPackages = "\\(test\\|benchmark\\)";
      meta.useUnstable = true;
      date = "2016-11-29";
    };
  
    grpc-gateway = buildFromGitHub {
  
negative.code:     version = 2;
      owner = "tidwall";
      repo = "gjson";
      date = "2016-12-02";
      rev = "c1e65a498d37a36a3f7dda77fb8cdee7b26940c9";
      sha256 = "0wvabjqxx784vhh8yamij4xzs1d2g4xzg6bw0ijjbhqz93rp9vyw";
      propagatedBuildInputs = [
        match
      ];
  