anchor.diff:      sha256 = "05f6qa8x3vhpdz1fcnpqk37fpnyyq13icqsk2gww5idjnh6kng26";
     };
   
  -  buildInputs = [ ocaml findlib dune ppx_tools_versioned ocaml-migrate-parsetree ];
  +  buildInputs = [ ppx_tools_versioned ocaml-migrate-parsetree ];
   
     propagatedBuildInputs = [ gen uchar ];
   
  
positive.code:     sha256 = "0gsb1jpj3mnqbjgbavi4l95gl6g4agq58j82km22fdfg63j3w3fk";
    };
  in
  stdenv.mkDerivation rec {
    name = "ocaml${ocaml.version}-sedlex-${version}";
    version = "2.1";
  
    src = fetchFromGitHub {
  
negative.code: { lib
  , fetchFromGitHub
  , fetchurl
  , buildDunePackage
  , ocaml
  , gen
  , ppx_tools_versioned
  , ocaml-migrate-parsetree
  , uchar
  }:
  
  if lib.versionOlder ocaml.version "4.02.3"
  then throw "sedlex is not available for OCaml ${ocaml.version}"
  else
  
  