anchor.diff:  
     disabled = !isPy3k;
   
  -  preCheck = ''
  -    # don't test bash builtins
  -    rm testing/test_argcomplete.py
  -  '';
  -
     src = fetchPypi {
       inherit pname version;
       sha256 = "85228d75db9f45e06e57ef9bf4429267f81ac7c0d742cc9ed63d09886a9fe6f4";
  
positive.code: 
    checkInputs = [ hypothesis pygments ];
    nativeBuildInputs = [ setuptools_scm ];
    propagatedBuildInputs = [ attrs py setuptools six pluggy more-itertools atomicwrites wcwidth packaging ]
      ++ stdenv.lib.optionals (pythonOlder "3.6") [ pathlib2 ];
  
    doCheck = !isPyPy; # https://github.com/pytest-dev/pytest/issues/3460
  
    # Ignored file https://github.com/pytest-dev/pytest/pull/5605#issuecomment-522243929
    checkPhase = ''
  
negative.code: , attrs
  , funcsigs
  , hypothesis
  , iniconfig
  , mock
  , more-itertools
  , packaging
  