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{-# Language RankNTypes, DerivingStrategies, TypeApplications,
ScopedTypeVariables, GADTs, PolyKinds #-}
module T14154 where
newtype Ran g h a
= MkRan (forall b. (a -> g b) -> h b)
newtype Swap p f g a where
MkSwap :: p g f a -> Swap p f g a
ireturn :: forall m i a. a -> m i i a
ireturn = undefined
xs = case ireturn @(Swap Ran) 'a' of
MkSwap (MkRan f) -> f print
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