anchor.diff:  , pytest-xdist
   , sortedcontainers
   , tzdata
  +, pythonOlder
   }:
   buildPythonPackage rec {
     # https://hypothesis.readthedocs.org/en/latest/packaging.html
  
positive.code:     sortedcontainers
    ];
  
    checkInputs = [ pytestCheckHook pytest-xdist pexpect ]
      ++ lib.optional (pythonAtLeast "3.9") tzdata;
  
    inherit doCheck;
  
  
negative.code: 
    pname = "hypothesis";
    version = "6.35.0";
    format = "setuptools";
  
    disabled = pythonOlder "3.7";
  
    src = fetchFromGitHub {
      owner = "HypothesisWorks";
      repo = "hypothesis-python";
  