anchor.diff:      rev = "v${version}";
       sha256 = "1lf31ldbrsmxhbrcg284pwpvjfmwnssv3gqwd5vm2hvd9lwqn6ii";
     };
  +
  +  # coverage tests aren't useful when consuming releases
  +  postPatch = ''
  +    substituteInPlace pyproject.toml \
  +      --replace '--cov' ""
  +  '';
  +
  +  nativeBuildInputs = [
  +    poetry-core
  +  ];
   
     propagatedBuildInputs = [
       aiohttp
  
positive.code: , aiohttp
  , yarl
  , aresponses
  , pytest-asyncio
  , pytestCheckHook
  }:
  
negative.code: buildPythonPackage rec {
    pname = "twentemilieu";
    version = "0.4.2";
    format = "pyproject";
    disabled = pythonOlder "3.7";
  
    src = fetchFromGitHub {
  