anchor.diff:     termcolor
      wrapt
      dill
  -   pathlibLocked
  +  ] ++ lib.optional (pythonOlder "3.4") pathlib;
  +
  +
  +  checkInputs = [
  +    pytest
     ];
   
  +  prePatch = ''
  +    substituteInPlace setup.py --replace \
  +      "'pathlib>=1.0.0,<2.0.0'," \
  +      "\"pathlib>=1.0.0,<2.0.0; python_version<'3.4'\","
  +
  +    substituteInPlace setup.py --replace \
  +      "'cytoolz>=0.8,<0.9'," \
  +      "'cytoolz>=0.8',"
  +  '';
  +
  +  # Cannot find cython modules.
     doCheck = false;
   
  -  # fails to import some modules
  -  # checkPhase = ''
  -  #   ${python.interpreter} -m pytest thinc/tests
  -  #   # cd thinc/tests
  -  #   # ${python.interpreter} -m unittest discover -p "*test*"
  -  # '';
  +  checkPhase = ''
  +    pytest thinc/tests
  +  '';
   
     meta = with stdenv.lib; {
       description = "Practical Machine Learning for NLP in Python";
       homepage = https://github.com/explosion/thinc;
       license = licenses.mit;
  -    maintainers = with maintainers; [ sdll ];
  +    maintainers = with maintainers; [ aborsu sdll ];
       };
   }
  
positive.code: , dill
  }:
  
  let
    enableDebugging = true;
  
    pathlibLocked = buildPythonPackage rec {
      name = "${pname}-${version}";
      pname = "pathlib";
      version = "1.0.1";
  
      src = fetchPypi {
        inherit pname version;
        sha256 = "17zajiw4mjbkkv6ahp3xf025qglkj0805m9s41c45zryzj6p2h39";
      };
  
      doCheck = false; # fails to import support from test
    };
  in buildPythonPackage rec {
    pname = "thinc";
    version = "6.5.1";
    name = pname + "-" + version;
  
    src = fetchFromGitHub {
      owner = "explosion";
      repo = "thinc";
      rev = "v${version}";
      sha256 = "008kmjsvanh6qgnpvsn3qacfcyprxirxbw4yfd8flyg7mxw793ws";
    };
  
    propagatedBuildInputs = [
     cython
     cymem
     preshed
     numpy
     murmurhash
  
negative.code: { stdenv
  , lib
  , pkgs
  , buildPythonPackage
  , fetchPypi
  , pythonOlder
  , pytest
  , cython
  , cymem
  , msgpack-numpy
  , msgpack-python
  , preshed
  , numpy
  , python
  , murmurhash
  , pathlib
  , hypothesis
  , tqdm
  , cytoolz
  