anchor.diff:  
   buildPythonPackage rec {
     pname = "watchfiles";
  -  version = "0.15.0";
  +  version = "0.18.0";
     format = "pyproject";
   
     disabled = pythonOlder "3.7";
  
positive.code:     pytestCheckHook
    ];
  
    pythonImportsCheck = [
      "watchfiles"
    ];
  
    meta = with lib; {
      broken = stdenv.isDarwin;
      description = "Simple, modern file watching and code reload";
      homepage = "https://watchfiles.helpmanual.io/";
      license = licenses.mit;
      maintainers = with maintainers; [ fab ];
    };
  }
  
negative.code: { lib
  , stdenv
  , anyio
  , buildPythonPackage
  , fetchFromGitHub
  