anchor.diff:  
   buildPythonPackage rec {
     pname = "python-language-server";
  -  version = "0.34.1";
  +  version = "0.36.2";
   
     src = fetchFromGitHub {
       owner = "palantir";
       repo = "python-language-server";
       rev = version;
  -    sha256 = "sha256-/tVzaoyUO6+7DSvnf3JxpcTY0rU+hHBu5qlru/ZTpxU=";
  +    sha256 = "07x6jr4z20jxn03bxblwc8vk0ywha492cgwfhj7q97nb5cm7kx0q";
     };
   
  -  patches = [
  -    # https://github.com/palantir/python-language-server/pull/851
  -    (fetchpatch {
  -      url = "https://github.com/palantir/python-language-server/commit/f513f3297132492dd41e001d943980e6c4f40809.patch";
  -      sha256 = "04c9hrb3dzlfchjk4625ipazyfcbq6qq2kj2hg3zf2xsny2jcvi5";
  -    })
  -  ];
  +  propagatedBuildInputs = [ setuptools jedi pluggy future python-jsonrpc-server flake8 ujson ]
  +    ++ stdenv.lib.optional (withProvider "autopep8") autopep8
  +    ++ stdenv.lib.optional (withProvider "mccabe") mccabe
  +    ++ stdenv.lib.optional (withProvider "pycodestyle") pycodestyle
  +    ++ stdenv.lib.optional (withProvider "pydocstyle") pydocstyle
  +    ++ stdenv.lib.optional (withProvider "pyflakes") pyflakes
  +    ++ stdenv.lib.optional (withProvider "pylint") pylint
  +    ++ stdenv.lib.optional (withProvider "rope") rope
  +    ++ stdenv.lib.optional (withProvider "yapf") yapf
  +    ++ stdenv.lib.optional isPy27 configparser
  +    ++ stdenv.lib.optionals (pythonOlder "3.2") [ backports_functools_lru_cache futures ];
   
  -  postPatch = ''
  -    # https://github.com/palantir/python-jsonrpc-server/issues/36
  -    sed -i -e 's!ujson<=!ujson>=!' setup.py
  -  '';
   
     # The tests require all the providers, disable otherwise.
     doCheck = providers == ["*"];
   
     checkInputs = [
  -    pytestCheckHook mock pytestcov coverage
  +    pytestCheckHook mock pytestcov coverage flaky
       # rope is technically a dependency, but we don't add it by default since we
       # already have jedi, which is the preferred option
       rope
  
positive.code: { lib, stdenv, buildPythonPackage, fetchFromGitHub, fetchpatch, pythonOlder, isPy27
  , backports_functools_lru_cache, configparser, futures, future, jedi, pluggy, python-jsonrpc-server, flake8
  , pytestCheckHook, mock, pytestcov, coverage, setuptools, ujson
  , # Allow building a limited set of providers, e.g. ["pycodestyle"].
    providers ? ["*"]
    # The following packages are optional and
  
negative.code:     "test_matplotlib_completions"
      "test_snippet_parsing"
      "test_numpy_hover"
      "test_symbols"
    ] ++ stdenv.lib.optional isPy27 "test_flake8_lint";
  
    meta = with lib; {
      homepage = "https://github.com/palantir/python-language-server";
  