anchor.diff:  { lib
   , buildPythonPackage
   , fetchPypi
  +, chardet
   , html5lib
   , lxml
   , pytestCheckHook
  
positive.code:   checkInputs = [
      pytestCheckHook
    ];
    nativeBuildInputs = [ sphinxHook ];
  
    pythonImportsCheck = [
      "bs4"
  
negative.code:     hash = "sha256-rZqlW2XvKAjrQF9Gz3Tff8twRNXLwmSH+W6y7y5DZpM=";
    };
  
    nativeBuildInputs = [
      sphinxHook
    ];
  
    propagatedBuildInputs = [
      chardet
      html5lib
      lxml
      soupsieve
  