anchor.diff:  
     checkInputs = [ hypothesis pygments ];
     nativeBuildInputs = [ setuptools_scm ];
  -  propagatedBuildInputs = [ attrs py setuptools six pluggy more-itertools atomicwrites wcwidth packaging ]
  -    ++ stdenv.lib.optionals (pythonOlder "3.6") [ pathlib2 ];
  +  propagatedBuildInputs = [
  +    atomicwrites
  +    attrs
  +    iniconfig
  +    more-itertools
  +    packaging
  +    pluggy
  +    py
  +    setuptools
  +    six
  +    toml
  +    wcwidth
  +  ] ++ stdenv.lib.optionals (pythonOlder "3.6") [ pathlib2 ];
   
     doCheck = !isPyPy; # https://github.com/pytest-dev/pytest/issues/3460
  +
  +  preCheck = ''
  +    # don't test bash builtins
  +    rm testing/test_argcomplete.py
  +  '';
   
     # Ignored file https://github.com/pytest-dev/pytest/pull/5605#issuecomment-522243929
     checkPhase = ''
  
positive.code: , attrs
  , funcsigs
  , hypothesis
  , mock
  , more-itertools
  , packaging
  
negative.code: , setuptools
  , setuptools_scm
  , six
  , toml
  , wcwidth
  , writeText
  }:
  