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I had some rule which matched an expression in a catch block. Jackpot suggested a replacement for the catch block body, but as usual also offered to completely reformat the try block body. Among its suggestions was to change Iterator<? extends Object> it = lookup.lookupAll(Object.class).iterator(); to Iterator<Bound> it = lookup.lookupAll(Object.class).iterator(); which of course is not valid code.
The old Jackpot module is no longer maintained. There is a rewrite in progress at: http://bitbucket.org/jlahoda/jackpot30/wiki/Home