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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE ImpredicativeTypes #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE UnboxedSums #-}
module Bug where
import Data.Kind
import Type.Reflection
newtype Foo = MkFoo (forall a. a)
foo :: TypeRep MkFoo
foo = typeRep @MkFoo
type family F a
type instance F Int = Type
data Bar = forall (a :: F Int). MkBar a
bar :: TypeRep (MkBar True)
bar = typeRep
data Quux = MkQuux (# Bool | Int #)
quux :: TypeRep MkQuux
quux = typeRep
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