anchor.diff:      name = "pylint-0.23.0";
   
       src = fetchurl {
  -      url = "http://ftp.logilab.org/pub/pylint/${name}.tar.gz";
  +      url = "ftp://ftp.logilab.org/pub/pylint/${name}.tar.gz";
         sha256 = "07091avcc2b374i5f3blszmawjcin8xssjfryz91qbxybb8r7c6d";
       };
       propagatedBuildInputs = [astng];
  
positive.code:     name = "logilab-astng-0.21.1";
  
      src = fetchurl {
        url = "http://ftp.logilab.org/pub/astng/${name}.tar.gz";
        sha256 = "0rqp2vwrnv6gkzdd96j078h1sz26plh49cmnyswy2wb6l4wans67";
      };
      propagatedBuildInputs = [logilabCommon];
  
negative.code:     name = "logilab-common-0.56.0";
  
      src = fetchurl {
        url = "ftp://ftp.logilab.org/pub/common/${name}.tar.gz";
        sha256 = "14p557nqypbd10d8k7qs6jlm58pksiwh86wvvl0axyki00hj6971";
      };
      propagatedBuildInputs = [unittest2];
  