anchor.diff:    };
   
     checkInputs = [
  -    pytest
       pyopenssl
       service-identity
  +    pytestCheckHook
     ];
   
     propagatedBuildInputs = [
  
positive.code: { lib
  , buildPythonPackage
  , fetchPypi
  , isPy3k
  , cryptography
  , futures ? null
  , pytest
  , pyopenssl
  , service-identity
  , idna
  }:
  
  
negative.code:     futures
    ];
  
    # aarch64-darwin forbids W+X memory, but this tests depends on it:
    # * https://github.com/pyca/pyopenssl/issues/873
    disabledTests = lib.optionals (stdenv.isDarwin && stdenv.isAarch64) [
      "test_pyopenssl_end_to_end"
    ];
  
    # Some of the tests use localhost networking.
    __darwinAllowLocalNetworking = true;
  