anchor.diff:      };
     };
   
  -  # TODO
  -  # Installs correctly but fails tests that involve simple things like:
  -  # cmd.run("tox", "-h")
  -  # also, buildPythonPackage needs to supply the tox.ini correctly for projects that use tox for their tests
  -  #
  -
     tox = buildPythonPackage rec {
  -    name = "tox-1.7.2";
  +    name = "tox-1.8.1";
   
       propagatedBuildInputs = with self; [ py virtualenv ];
   
  
positive.code: 
      src = pkgs.fetchurl {
        url = "https://pypi.python.org/packages/source/t/tox/${name}.tar.gz";
        md5 = "0d9b3acb1a9252659d753b0ae6b9b264";
      };
    };
  
  
negative.code:         --replace '@@taskwarrior@@' '${pkgs.taskwarrior}'
      '';
  
      buildInputs = with self; [ nose pkgs.taskwarrior tox ];
      propagatedBuildInputs = with self; [ six dateutil pytz ];
  
      meta = {
  