anchor.diff:      frozenlist
     ];
   
  -  # not compatible w ith latest asyncio
  -  doCheck = false;
     checkInputs = [
       pytest-asyncio
       pytestCheckHook
  
positive.code: 
  buildPythonPackage rec {
    pname = "aiosignal";
    version = "1.2.0"; # re-enable tests after 1.2.0
    disabled = pythonOlder "3.6";
  
    src = fetchFromGitHub {
  
negative.code: 
    postPatch = ''
      substituteInPlace pytest.ini \
        --replace "filterwarnings = error" "" \
        --replace "--cov=aiosignal" ""
    '';
  
  