anchor.diff:            })
             (fetchurl {
               url = mirror://ubuntu/dists/quantal/universe/binary-amd64/Packages.bz2;
  -            sha256 = "c762bd4ed063326577a62ff783cf9720e772b03d4a2aa38048918ee6287b96ce";
  +            sha256 = "329a98312248c98092f8b91f232fc68fd3e6e2337ea4f348b3785465ae8dae17";
             })
           ];
         urlPrefix = mirror://ubuntu;
  
positive.code:           })
            (fetchurl {
              url = mirror://ubuntu/dists/raring/universe/binary-i386/Packages.bz2;
              sha256 = "1db19982fc3689b00a918e2cdbb936dfccebbac2ed82f81bb0164a3d51039012";
            })
          ];
        urlPrefix = mirror://ubuntu;
  
negative.code:           })
            (fetchurl {
              url = mirror://ubuntu/dists/saucy/universe/binary-amd64/Packages.bz2;
              sha256 = "a899ce5513ce8540ce9b8da4c1cd85b16b231900881b3aa559f7ac3182cdbfc8";
            })
          ];
        urlPrefix = mirror://ubuntu;
  