anchor.diff: -{ lib, isPy3k, pythonOlder, fetchPypi, buildPythonPackage
  -, pytest
  -, pytest-cov
  +{ lib
  +, buildPythonPackage
  +, fetchPypi
  +, pytestCheckHook
  +, pythonOlder
   , sybil
   , typing-extensions
   }:
  
positive.code:   ];
  
    checkInputs = [
      pytest pytest-cov sybil
    ];
  
    checkPhase = ''
      pytest
    '';
  
    meta = with lib; {
      homepage = "https://public.readthedocs.io/en/latest/";
      description = "A decorator and function which populates a module's __all__ and globals";
      longDescription = ''
        This is a very simple decorator and function which populates a module's
        __all__ and optionally the module globals.
  
        This provides both a pure-Python implementation and a C implementation. It is
        proposed that the C implementation be added to builtins_ for Python 3.6.
  
        This proposal seems to have been rejected, for more information see
        https://bugs.python.org/issue26632.
      '';
      license = licenses.asl20;
      maintainers = with maintainers; [ eadwu ];
  
negative.code: buildPythonPackage rec {
    pname = "atpublic";
    version = "2.3";
    format = "setuptools";
  
    disabled = pythonOlder "3.6";
  
    src = fetchPypi {
      inherit pname version;
  