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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
module T16255 where
import Data.Kind
import GHC.TypeLits
data SBool :: Bool -> Type
type family F1 :: forall k. k -> Type where
F1 @Bool = SBool
data family D1 :: forall k. k -> Type
-- Note that this similar-looking data family instance is OK, since data family
-- instances permit oversaturation in their equations.
data instance D1 @Bool :: Bool -> Type
type family F2 (x :: j) :: forall k. Either j k where
F2 5 @Symbol = Left 4
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