anchor.diff:    doCheck = true;
     checkPhase = "dune runtest";
   
  -  meta = with stdenv.lib; {
  +  meta = with lib; {
       inherit (src.meta) homepage;
       description = "Ocaml bindings to Pytorch";
       maintainers = [ maintainers.bcdarwin ];
  
positive.code: 
  buildDunePackage rec {
    pname = "torch";
    version = "0.8";
  
    owner = "LaurentMazare";
  
    minimumOCamlVersion = "4.07";
  
    src = fetchFromGitHub {
      inherit owner;
      repo   = "ocaml-${pname}";
      rev    = version;
      sha256 = "19w31paj24pns2ahk9j9rgpkb5hpcd41kfaarxrlddww5dl6pxvi";
    };
  
    propagatedBuildInputs = [
  
negative.code: { lib
  , buildDunePackage
  , fetchFromGitHub
  , cmdliner
  