anchor.diff:  { lib
  +, stdenv
   , buildPythonPackage
   , fetchPypi
   , setuptools-scm
   , pytestCheckHook
  +, pytest-asyncio
  +, pytest-tornado
   , pytestcov
   , sqlalchemy
   , tornado
  
positive.code:   ];
  
    checkInputs = [
      pytestCheckHook
      pytestcov
      sqlalchemy
      tornado
      twisted
      mock
      trollius
      gevent
    ];
  
    propagatedBuildInputs = [
      six
  
negative.code:     setuptools
    ] ++ lib.optional (!isPy3k) futures;
  
    disabledTests = lib.optionals stdenv.isDarwin [
      "test_submit_job"
      "test_max_instances"
    ];
  
    pythonImportsCheck = [ "apscheduler" ];
  
    meta = with lib; {
  