anchor.diff:  { stdenv
   , lib
   , buildPythonPackage
  -, fetchPypi
  +, fetchFromGitHub
   , pythonOlder
   , installShellFiles
   , astroid
   , isort
   , mccabe
  +, platformdirs
   , toml
   , pytest-benchmark
   , pytest-xdist
  
positive.code:     astroid
      isort
      mccabe
      toml
    ];
  
  
negative.code: 
  buildPythonPackage rec {
    pname = "pylint";
    version = "2.10.2";
  
    disabled = pythonOlder "3.6";
  
    src = fetchFromGitHub {
      owner = "PyCQA";
      repo = pname;
      rev = "v${version}";
      sha256 = "sha256-hkrkgUdC5LO1oSPFL6gvIk0zFpMw45gCmnoRbdPZuRs=";
    };
  
    nativeBuildInputs = [
  