anchor.diff:  
     LC_ALL = "en_US.utf8";
   
  -  checkInputs = [ nose glibcLocales ]
  +  checkInputs = [ nose pytestCheckHook glibcLocales ]
       ++ (if isPy3k then [ nose_warnings_filters ] else [ mock ]);
   
     propagatedBuildInputs = [
       jinja2 tornado ipython_genutils traitlets jupyter_core send2trash
       jupyter_client nbformat nbconvert ipykernel terminado requests pexpect
  -    prometheus_client
  +    prometheus_client argon2_cffi
     ];
   
     # disable warning_filters
  
positive.code: , tornado
  , ipython_genutils
  , traitlets
  , jupyter_core
  , jupyter_client
  , nbformat
  
negative.code: , lib
  , buildPythonPackage
  , fetchPypi
  , argon2_cffi
  , nose
  , nose_warnings_filters
  , glibcLocales
  