anchor.diff:      platforms = lib.platforms.unix;
       maintainers = with lib.maintainers; [ ericsagnes ];
     };
  -}+}
  
positive.code: { lib
  , buildPythonPackage
  , fetchPypi
  , freezegun
  }:
  
  
negative.code:   pname = "cached-property";
    version = "1.4.0";
  
    # conftest.py is missing in PyPI tarball
    # https://github.com/pydanny/cached-property/pull/87
    src = fetchFromGitHub {
      owner = "pydanny";
      repo = pname;
      rev = version;
      sha256 = "0w7709grs4yqhfbnn7lva2fgyphvh43xcfqhi95lhh8sjad3xwkw";
    };
  
    checkInputs = [ pytest freezegun ];
  
    checkPhase = ''
      py.test
    '';
  
    meta = {
      description = "A decorator for caching properties in classes";
  