anchor.diff:  , plac
   , six
   , mock
  -, termcolor
   , wrapt
   , dill
   }:
   
   buildPythonPackage rec {
     pname = "thinc";
  -  version = "6.12.0";
  +  version = "6.12.1";
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "0lfdf08v7rrj9b29z2vf8isaqa0zh16acw9im8chkqsh8bay4ykm";
  +    sha256 = "1kkp8b3xcs3yn3ia5sxrh086c9xv27s2khdxd17abdypxxa99ich";
     };
   
     buildInputs = lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
  
positive.code:    preshed
     numpy
     murmurhash
     pytest
     hypothesis
     tqdm
     cytoolz
     plac
     six
     mock
     termcolor
     wrapt
     dill
    ] ++ lib.optional (pythonOlder "3.4") pathlib;
  
  
    checkInputs = [
      pytest
    ];
  
  
negative.code:     substituteInPlace setup.py \
        --replace "pathlib==1.0.1" "pathlib>=1.0.0,<2.0.0" \
        --replace "plac>=0.9.6,<1.0.0" "plac>=0.9.6" \
        --replace "msgpack-numpy<0.4.4" "msgpack-numpy"
    '';
  
    # Cannot find cython modules.
  