anchor.diff:      unittestCheckHook
     ];
   
  +  pythonImportsCheck = [
  +    "sigtools"
  +  ];
  +
     meta = with lib; {
  -    description = "Utilities for working with 3.3's inspect.Signature objects.";
  -    homepage = "https://pypi.python.org/pypi/sigtools";
  +    description = "Utilities for working with inspect.Signature objects";
  +    homepage = "https://sigtools.readthedocs.io/";
       license = licenses.mit;
  +    maintainers = with maintainers; [ ];
     };
  -
   }
  
positive.code: { lib
  , buildPythonPackage
  , fetchPypi
  , pythonOlder
  , sphinx
  , mock
  , repeated-test
  , unittestCheckHook
  , attrs
  , setuptools-scm
  }:
  
  buildPythonPackage rec {
  
negative.code: 
    src = fetchPypi {
      inherit pname version;
      hash = "sha256-S44TWpzU0uoA2mcMCTNy105nK6OruH9MmNjnPepURFw=";
    };
  
    nativeBuildInputs = [
  