anchor.diff:  
   buildPythonPackage rec {
     pname = "black";
  -  version = "21.12b0";
  +  version = "22.1.0";
   
     disabled = pythonOlder "3.6";
   
     src = fetchPypi {
       inherit pname version;
  -    hash = "sha256-d7gPaTpWni5SeVhFljTxjfmwuiYluk4MLV2lvkLm8rM=";
  +    hash = "sha256-p8AZLTVjX2/BF0vldct5FekuXdYp7nn9rw3PpBqAr7U=";
     };
   
     nativeBuildInputs = [ setuptools-scm ];
  
positive.code: { stdenv, lib
  , buildPythonPackage, fetchPypi, pythonOlder, setuptools-scm, pytestCheckHook
  , aiohttp
  , aiohttp-cors
  , attrs
  , click
  , colorama
  , dataclasses
  
negative.code:   propagatedBuildInputs = [
      aiohttp
      aiohttp-cors
      click
      colorama
      mypy-extensions
      pathspec
      platformdirs
      tomli
      uvloop
    ] ++ lib.optional (pythonOlder "3.8") typed-ast
    ++ lib.optional (pythonOlder "3.10") typing-extensions;
  
    meta = with lib; {
      description = "The uncompromising Python code formatter";
  