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{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE DataKinds #-}
module Bug where
import Data.Kind
import Data.Proxy
newtype S (f :: k1 -> k2)
= MkS (forall t. Proxy t -> Proxy (f t))
foo :: forall (a :: Type)
(f :: forall (x :: a). Proxy x -> Type).
S f -> ()
foo (MkS (sF :: _)) = ()
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