anchor.diff:  
   
     zope_deprecation = buildPythonPackage rec {
  -    name = "zope.deprecation-3.5.0";
  +    name = "zope.deprecation-3.5.1";
   
       src = fetchurl {
         url = "http://pypi.python.org/packages/source/z/zope.deprecation/${name}.tar.gz";
  -      md5 = "1e7db82583013127aab3e7e790b1f2b6";
  +      md5 = "836cfea5fad548cd5a0d9af1300ec05e";
       };
   
       buildInputs = [ zope_testing ];
  
positive.code: 
  
    pyramid_exclog = buildPythonPackage rec {
      name = "pyramid_exclog-0.6";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/p/pyramid_exclog/${name}.tar.gz";
        md5 = "5c18706f5500605416afff311120c933";
      };
  
      propagatedBuildInputs = [ pyramid ];
  
negative.code: 
  
    colander = buildPythonPackage rec {
      name = "colander-1.0b1";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/c/colander/${name}.tar.gz";
        md5 = "89f2cf4b5c87d43f7917d6a0d4872e6a";
      };
  
      propagatedBuildInputs = [ pythonPackages.translationstring ];
  