anchor.diff:    });
   
     darcsver = buildPythonPackage (rec {
  -    name = "darcsver-1.7.2";
  +    name = "darcsver-1.7.4";
   
       src = fetchurl {
         url = "http://pypi.python.org/packages/source/d/darcsver/${name}.tar.gz";
  -      md5 = "94ca7e8c9ea0f69c0f3fc6f9fc88f65a";
  +      md5 = "e38aecd1343ab8447888a479ab12cb59";
       };
   
       buildInputs = [ mock ];
  
positive.code:       sha256 = "1gasiy5lwbhsxw27g36d88n36xbj52434klisvqhljgckd4xqcy7";
      };
  
      # No tests implemented
      doCheck = false;
  
      meta = {
        homepage = http://www.crummy.com/software/BeautifulSoup/;
  
negative.code: 
  
    cherrypy = buildPythonPackage (rec {
      name = "cherrypy-3.2.2";
  
      src = fetchurl {
        url = "http://download.cherrypy.org/cherrypy/3.2.2/CherryPy-3.2.2.tar.gz";
        sha256 = "14dn129h69wj0h8yr0bjwbrk8kygl6mkfnxc5m3fxhlm4xb8hnnw";
      };
  
      buildInputs = [ markdown nose ];
  
      # XXX: tests hang
      doCheck = false;
      checkPhase = "cd cherrypy && nosetests -s test/";
  
      meta = {
        homepage = "http://www.cherrypy.org";
  