anchor.diff:          owner = "comby-tools";
           repo = "comby";
           rev = version;
  -        sha256 = "sha256-Y2RcYvJOSqppmxxG8IZ5GlFkXCOIQU+1jJZ6j+PBHC4";
  +        sha256 = "0k60hj8wcrvrk0isr210vnalylkd63ria1kgz5n49inl7w1hfwpv";
         };
   
         nativeBuildInputs = [
  
positive.code:     ocamlPackages.parany
      ocamlPackages.conduit-lwt-unix
      ocamlPackages.lwt_react
      ocamlPackages.tls
      combyKernel
      combySemantic
  
negative.code:   mkCombyPackage = { pname, extraBuildInputs ? [ ], extraNativeInputs ? [ ], preBuild ? "" }:
      ocamlPackages.buildDunePackage rec {
        inherit pname preBuild;
        version = "1.7.1";
        useDune2 = true;
        minimumOcamlVersion = "4.08.1";
        doCheck = true;
  