anchor.diff:            })
             (fetchurl {
               url = mirror://ubuntu/dists/raring/universe/binary-amd64/Packages.bz2;
  -            sha256 = "0caf561bad359e8a82a987a076c0f1cb7a43412a5de053c105b160477c192978";
  +            sha256 = "8aba137ae18540a12de03a564c11496431a150ab2d4d1e93e2b4b691fa2a4850";
             })
           ];
         urlPrefix = mirror://ubuntu;
  
positive.code:       packagesLists =
          [ (fetchurl {
              url = mirror://ubuntu/dists/trusty/main/binary-i386/Packages.bz2;
              sha256 = "1bld2z47cc8adlqgfib1hypj5zwdqalhizzgpmkr3rmmb095lbma";
            })
            (fetchurl {
              url = mirror://ubuntu/dists/trusty/universe/binary-i386/Packages.bz2;
              sha256 = "03xqi9vd653hdf31a2l6p3zqfmywwvwlsc54dymxji8ppj7mcgkz";
            })
          ];
        urlPrefix = mirror://ubuntu;
  
negative.code:       packagesList =
          [ (fetchurl {
              url = mirror://ubuntu/dists/trusty/main/binary-amd64/Packages.bz2;
              sha256 = "7095917eb8e4ac9161bc3b2ceeaf86e9265aae7b855a0e15d72096ecb05f1fc2";
            })
            (fetchurl {
              url = mirror://ubuntu/dists/trusty/universe/binary-amd64/Packages.bz2;
              sha256 = "558637eeb8e340b871653e2060effe36e064677eca4eae62d9e4138dd402a610";
            })
          ];
        urlPrefix = mirror://ubuntu;
  