anchor.diff:  
     # zope.interface collision
     doCheck = !isPy27;
  -  checkInputs = [ git twisted pytestCheckHook ];
  +  checkInputs = [
  +    git
  +    mock
  +    twisted
  +    pytestCheckHook
  +  ];
     pythonImportsCheck = [ "towncrier" ];
   
     meta = with lib; {
  
positive.code: , click-default-group
  , incremental
  , jinja2
  , pytestCheckHook
  , toml
  , twisted
  
negative.code: 
  buildPythonPackage rec {
    pname = "towncrier";
    version = "21.3.0";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "6eed0bc924d72c98c000cb8a64de3bd566e5cb0d11032b73fcccf8a8f956ddfe";
    };
  
    propagatedBuildInputs = [
  