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{-# LANGUAGE QuantifiedConstraints #-}
module T21037 where
type f ~> g = forall x. f x -> g x
class (forall f. Functor f => Functor (h f)) => HFunctor h where
hmap :: (f ~> g) -> (h f ~> h g)
class (forall m. Monad m => Monad (h m), HFunctor h) => HMonad h where
hreturn :: Monad m => m ~> h m
hdnib :: (Monad m, Monad n) => (m ~> h n) -> h m ~> h n
bar :: (HMonad h, Monad f) => (Functor (h f) => c) -> c
bar x = x
baz ::
( forall m. Monad m => Monad (h m),
forall f. Functor f => Functor (h f),
Monad f
) =>
(Functor (h f) => c) ->
c
baz x = x
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