anchor.diff:  , traitlets
   , tornado
   , pythonOlder
  -, pytest
  +, pytestCheckHook
   , nose
   }:
   
  
positive.code:     })
    ];
  
    # For failing tests, see https://github.com/ipython/ipykernel/issues/387
    checkPhase = ''
      HOME=$(mktemp -d) pytest ipykernel -k "not (test_sys_path or test_sys_path_profile_dir or test_complete)"
    '';
  
    # Some of the tests use localhost networking.
  
negative.code:     sha256 = "04jx6ihj3zpj4c7acqa14gl37mpdnbgmfm4nvv97xkjc1cz920xm";
    };
  
    propagatedBuildInputs = [ ipython jupyter_client traitlets tornado ];
  
    # https://github.com/ipython/ipykernel/pull/377
  