anchor.diff:            })
             (fetchurl {
               url = mirror://ubuntu/dists/quantal/universe/binary-amd64/Packages.bz2;
  -            sha256 = "c762bd4ed063326577a62ff783cf9720e772b03d4a2aa38048918ee6287b96ce";
  +            sha256 = "329a98312248c98092f8b91f232fc68fd3e6e2337ea4f348b3785465ae8dae17";
             })
           ];
         urlPrefix = mirror://ubuntu;
  
positive.code:       packagesList =
          [ (fetchurl {
              url = mirror://ubuntu/dists/trusty/main/binary-amd64/Packages.bz2;
              sha256 = "11cw9flmnq3wappmwk87h19jzyrsan15h6p0mmb30ypnrqaz7g9j";
            })
            (fetchurl {
              url = mirror://ubuntu/dists/trusty/universe/binary-amd64/Packages.bz2;
              sha256 = "06nn3ci8s7zgwharxm76bcbqmnqknpds67zffylyii5hgmbjcnxm";
            })
          ];
        urlPrefix = mirror://ubuntu;
  
negative.code:           })
            (fetchurl {
              url = mirror://ubuntu/dists/saucy/universe/binary-amd64/Packages.bz2;
              sha256 = "a899ce5513ce8540ce9b8da4c1cd85b16b231900881b3aa559f7ac3182cdbfc8";
            })
          ];
        urlPrefix = mirror://ubuntu;
  