anchor.diff:  
   buildOcaml rec {
     name = "reason";
  -  version = "3.0.4";
  +  version = "3.3.2";
   
     src = fetchFromGitHub {
       owner = "facebook";
       repo = "reason";
  -    rev = version;
  -    sha256 = "15qhx85him5rr4j0ygj3jh3qv9ijrn82ibr9scbn0qrnn43kj047";
  +    rev = "68a4124c772ee25c4729b005c8643851b1e17b92";
  +    sha256 = "01v17m94ds98qk727mwpyx0a362zdf9s8x1fh8gp9jd9v3n6bc2d";
     };
   
     propagatedBuildInputs = [ menhir merlin_extend ppx_tools_versioned ];
  
positive.code: 
    createFindlibDestdir = true;
  
    postPatch = ''
      substituteInPlace src/reasonbuild/myocamlbuild.ml \
        --replace "refmt --print binary" "$out/bin/refmt --print binary"
    '';
  
    installPhase = ''
      ${jbuilder.installPhase}
  
      wrapProgram $out/bin/rtop \
        --prefix PATH : "${utop}/bin" \
  
negative.code:   meta = with stdenv.lib; {
      homepage = https://reasonml.github.io/;
      description = "Facebook's friendly syntax to OCaml";
      license = licenses.mit;
      maintainers = [ maintainers.volth ];
    };
  }
  