Hi Nathan, > DataAlt c | Right tag <- genDataConTag c -> return $ Cond tag
Are you sure, that genDataConTag always returns a 'Right'? If it returns a 'Left', than the pattern won't match. Greetings, Daniel _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
