anchor.diff:  
   
     deform = buildPythonPackage rec {
  -    name = "deform-0.9.9";
  +    name = "deform-2.0a2";
   
       src = pkgs.fetchurl {
         url = "http://pypi.python.org/packages/source/d/deform/${name}.tar.gz";
  -      sha256 = "0ympsjhxz5v8h4hi1mv811h064221bh26d68l9hv1x6m7sxbxpd0";
  +      md5 = "7a90d41f7fbc18002ce74f39bd90a5e4";
       };
   
       buildInputs = with self; [] ++ optional isPy26 unittest2;
  
positive.code:   };
  
    translationstring = buildPythonPackage rec {
      name = "translationstring-1.1";
  
      src = pkgs.fetchurl {
        url = "http://pypi.python.org/packages/source/t/translationstring/${name}.tar.gz";
        md5 = "0979b46d8f0f852810c8ec4be5c26cf2";
      };
  
      meta = {
  
negative.code: 
  
    zope_deprecation = buildPythonPackage rec {
      name = "zope.deprecation-4.1.2";
  
      src = pkgs.fetchurl {
        url = "http://pypi.python.org/packages/source/z/zope.deprecation/${name}.tar.gz";
        md5 = "e9a663ded58f4f9f7881beb56cae2782";
      };
  
      buildInputs = with self; [ zope_testing ];
  