anchor.diff:        --replace "self.assertEqual(url, \"https://www.google.com\")" ""
       substituteInPlace setup.py \
         --replace mypy-extensions==0.4.1 mypy-extensions>=0.4.1
  +  '' + lib.optionalString (!withServer) ''
  +    rm tests/test_{server,views}.py
     '';
   
     postInstall = ''
  
positive.code:       });
      };
    };
  in
  with python3'.pkgs; buildPythonApplication rec {
    version = "4.6";
  
negative.code: { lib, python3, fetchFromGitHub, withServer ? false }:
  
  let
    python3' = python3.override {
  