anchor.diff:      rev = "v${version}";
       sha256 = "sha256-DKqfv5gf9gzbnEPQSzy2mAaVYJZL9jmTKyGWVzj40T4=";
     };
  +
  +  propagatedBuildInputs = [
  +    six
  +  ];
   
     checkInputs = [
       future
  
positive.code: buildPythonPackage rec {
    pname = "pymemcache";
    version = "3.5.1";
  
    src = fetchFromGitHub {
      owner = "pinterest";
  
negative.code: { lib
  , buildPythonPackage
  , fetchFromGitHub
  , six
  , future
  , mock
  , pytestCheckHook
  