anchor.diff:  
   buildPythonPackage rec {
     pname = "black";
  -  version = "21.7b0";
  +  version = "21.8b0";
   
     disabled = pythonOlder "3.6";
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "06d27adq6v6p8wspi0wwqz2pnq34p5jhnqvijbin54yyj5j3qdy8";
  +    sha256 = "sha256-VwYI0oqjrxeSuYxKM326xjZ4d7R7EriKtCCVz8GmJ8I=";
     };
   
     nativeBuildInputs = [ setuptools-scm ];
  
positive.code:     colorama
      mypy-extensions
      pathspec
      regex
      tomli
      typed-ast # required for tests and python2 extra
  
negative.code: , mypy-extensions
  , pathspec
  , parameterized
  , platformdirs
  , regex
  , tomli
  , typed-ast
  