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{-# LANGUAGE ExistentialQuantification, MultiParamTypeClasses,
FunctionalDependencies, Rank2Types #-}
module Q where
class Transformer t a | t -> a where
transform :: t -> l a -> (forall l'. l' a -> b) -> b
data EL a = forall l. EL (l a)
unEL :: EL a -> (forall l. l a -> b) -> b
unEL = undefined
transform' :: (Transformer t a) => t -> EL a -> EL a
transform' = undefined
data MultiToggleS ts a = MultiToggleS ts
data MultiToggle = MultiToggle
expand :: HList ts a => MultiToggleS ts a -> MultiToggle
expand (MultiToggleS ts) =
resolve ts
(\x mt ->
let g = transform' x in
mt
)
MultiToggle
class HList c a | c -> a where
resolve :: c -> (forall t. (Transformer t a) => t -> b) -> b
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