http://deni-ok.livejournal.com/ ([identity profile] deni-ok.livejournal.com) wrote in [personal profile] deniok 2015-03-30 10:37 am (UTC)

Для этого потребуются FlexibleInstances и UndecidableInstances для объявления и еще и OverlappingInstances, если у нас встретятся прямые реализации представителей Foldable.
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