anchor.diff:      cargoCheckHook
     ];
   
  +  passthru.tests = {
  +    python = python3.pkgs.deltachat;
  +  };
  +
     meta = with lib; {
       description = "Delta Chat Rust Core library";
       homepage = "https://github.com/deltachat/deltachat-core-rust/";
  
positive.code:   cargoDeps = rustPlatform.fetchCargoTarball {
      inherit src;
      name = "${pname}-${version}";
      hash = "sha256-Fn4M4CQV7VTE7SubvOszhpGBbmDyqemyUeZ0qDmcGUU=";
    };
  
    nativeBuildInputs = [
  
negative.code: , openssl
  , perl
  , pkg-config
  , python3
  , rustPlatform
  , sqlcipher
  , sqlite
  