anchor.diff:      pytest
     '';
   
  -  disabled = isPy38;
  +  patches = [
  +    (fetchpatch {
  +      url = "https://github.com/palantir/python-jsonrpc-server/commit/0a04cc4e9d44233b1038b12d63cd3bd437c2374e.patch";
  +      sha256 = "177zdnp1808r2pg189bvzab44l8i2alsgv04kmrlhhnv40h66qyg";
  +    })
  +    (fetchpatch {
  +      url = "https://github.com/palantir/python-jsonrpc-server/commit/5af6e43d0c1fb9a6a29b96d38cfd6dbeec85d0ea.patch";
  +      sha256 = "1gx7lc1jxar1ngqqfkdn21s46y1mfnjf7ky2886ydk53nkaba91m";
  +    })
  +  ];
   
     propagatedBuildInputs = [ future ujson ]
       ++ stdenv.lib.optional (pythonOlder "3.2") futures;
  
positive.code: { stdenv, buildPythonPackage, fetchFromGitHub, pythonOlder
  , pytest, mock, pytestcov, coverage
  , future, futures, ujson, isPy38
  }:
  
  buildPythonPackage rec {
  
negative.code: 
    postPatch = ''
      sed -i 's/version=versioneer.get_version(),/version="${version}",/g' setup.py
      # https://github.com/palantir/python-jsonrpc-server/issues/36
      sed -i -e 's!ujson<=!ujson>=!' setup.py
    '';
  
    checkInputs = [
  