Date: 2012-12-01 10:57 pm (UTC)
Вот держите обещанную переделку на а ля карт:

http://hpaste.org/78604

Data.Functor.Fixedpoint находится в unification-fd, импорт можно заменить на ровно две строчки:

newtype Fix f = Fix { unFix :: f (Fix f) }
cata phi = phi . fmap self . unFix
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Dmitry Antonyuk

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