anchor.diff: -{ stdenv, fetchFromGitHub, ocaml, findlib, cppo, gen, sequence, qtest, ounit, ocaml_oasis, result }:
  +{ stdenv, fetchFromGitHub, ocaml, findlib, cppo, gen, sequence, qtest, ounit, ocaml_oasis, result
  +, qcheck }:
   
   let
   
  
positive.code:     owner = "c-cube";
      repo = "ocaml-containers";
      rev = "${version}";
      sha256 = "1mc33b4nvn9k3r4k56amxr804bg5ndhxv92cmjzg5pf4qh220c2h";
    };
  
    buildInputs = [ ocaml findlib cppo gen sequence qtest ounit ocaml_oasis ];
  
    propagatedBuildInputs = [ result ];
  
  
negative.code:     let v = stdenv.lib.getVersion ocaml; in
        "${p}/lib/ocaml/${v}/site-lib";
  
    version = "0.18";
  
  in
  
  