Date: 2007-12-14 12:25 pm (UTC)
From: [identity profile] deni-ok.livejournal.com
(->) имеет kind *->*->* а для функторов требуется *->*. Надо связать один из, тогда есть две возможности (ко- и контрвариантная)

instance типаFunctor (a->)

vs.

instance типаFunctor (->b)

Как-то так.
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