anchor.diff:    src = fetchPyPi {
       package = "bleach";
       inherit version;
  -    sha256 = "978e758599b54cd3caa2e160d74102879b230ea8dc93871d0783721eef58bc65";
  +    sha256 = "b9522130003e4caedf4f00a39c120a906dcd4242329c1c8f621f5370203cbc30";
     };
   
     propagatedBuildInputs = [
  
positive.code: { stdenv
  , buildPythonPackage
  , fetchPyPi
  
  , html5lib
  , six
  }:
  
  let
    version = "1.5.0";
  in
  buildPythonPackage {
    name = "bleach-${version}";
  
negative.code:   ];
  
    postPatch = ''
      sed -i setup.py \
        -i bleach.egg-info/requires.txt \
        -e '/html5lib/ s/\(,\|\)\(!\|>\|<\|=\)\(=\|\)[0-9.]\+//g'
    '';
  
    meta = with lib; {
      maintainers = with maintainers; [
        wkennington
      ];
  