anchor.diff:    overridable = builtins.removeAttrs attrs [ "compileFlags" "mixNixDeps" ];
   in
   assert mixNixDeps != { } -> mixFodDeps == null;
  +assert stripDebug -> !enableDebugInfo;
  +
   stdenv.mkDerivation (overridable // {
     # rg is used as a better grep to search for erlang references in the final release
     nativeBuildInputs = nativeBuildInputs ++ [ erlang hex elixir makeWrapper git ripgrep ];
  
positive.code: , mixNixDeps ? { }
  , elixir ? inputs.elixir
  , hex ? inputs.hex.override { inherit elixir; }
  , ...
  }@attrs:
  let
  
negative.code:         substituteInPlace "$file" --replace "${erlang}/lib/erlang" "$out"
        done
      fi
    '' + lib.optionalString stripDebug ''
      # strip debug symbols to avoid hardreferences to "foreign" closures actually
      # not needed at runtime, while at the same time reduce size of BEAM files.
      erl -noinput -eval 'lists:foreach(fun(F) -> io:format("Stripping ~p.~n", [F]), beam_lib:strip(F) end, filelib:wildcard("'"$out"'/**/*.beam"))' -s init stop
    '';
  
    # TODO investigate why the resulting closure still has
  