anchor.diff:    propagatedBuildInputs = [
       attrs
       sortedcontainers
  +  ] ++ lib.optionals (pythonOlder "3.11") [
  +    exceptiongroup
     ];
   
     checkInputs = [
  
positive.code: { lib
  , buildPythonPackage
  , pythonAtLeast
  , fetchFromGitHub
  , attrs
  , pexpect
  , doCheck ? true
  , pytestCheckHook
  
negative.code:     owner = "HypothesisWorks";
      repo = "hypothesis";
      rev = "hypothesis-python-${version}";
      hash = "sha256-G7OXlYaCPBfdXtmX/f/6i2LRCZZk5yvzhLc6sissuRo=";
    };
  
    postUnpack = "sourceRoot=$sourceRoot/hypothesis-python";
  