anchor.diff:    mkCombyPackage = { pname, extraBuildInputs ? [ ], extraNativeInputs ? [ ], preBuild ? "" }:
       ocamlPackages.buildDunePackage rec {
         inherit pname preBuild;
  -      version = "1.7.0";
  +      version = "1.7.1";
         useDune2 = true;
         minimumOcamlVersion = "4.08.1";
         doCheck = true;
  
positive.code:     ocamlPackages.parany
      ocamlPackages.conduit-lwt-unix
      ocamlPackages.lwt_react
      ocamlPackages.tls
      combyKernel
      combySemantic
  
negative.code:         owner = "comby-tools";
          repo = "comby";
          rev = version;
          sha256 = "0k60hj8wcrvrk0isr210vnalylkd63ria1kgz5n49inl7w1hfwpv";
        };
  
        nativeBuildInputs = [
  