@samplesurgeon given newtype Kleisli a m b = K (a -> m b) then Monad m => (Kleisli a m) ... instance Monad m => Category (Kleisli a m) ...
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@samplesurgeon given newtype Kleisli a m b = K (a -> m b) then Monad m => (Kleisli a m) ... instance Monad m => Category (Kleisli a m) ...