anchor.diff:        appengine
         asn1-ber
         mgo_v2
  -      grpc-go
  +      grpc
         pester
         logxi
         go-colorable
  
positive.code:     buildInputs = [ protobuf ];
    };
  
    grpc-go = buildFromGitHub {
      version = 1;
      rev = "9874075aee19e6927aa4ff5b76ee25701bb95922";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "1wswi0ji04ysvbk8972gc4705v2gqz5n9vsyfjzxwjxpn73m3ps3";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [ "github.com/grpc/grpc-go" ];
      propagatedBuildInputs = [ http2 net protobuf oauth2 glog ];
      excludedPackages = "\\(test\\|benchmark\\)";
      meta.useUnstable = true;
      date = "2016-08-24";
    };
  
    gucumber = buildFromGitHub {
  
negative.code:     ];
      propagatedBuildInputs = [
        google-api-go-client
        grpc
        net
        oauth2
      ];
  