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{-# LANGUAGE DataKinds, KindSignatures, GADTs, TypeFamilies #-}
{-# OPTIONS_GHC -fwarn-incomplete-patterns -fwarn-overlapping-patterns #-}
module T8970 where
import Data.Kind (Type)
data K = Foo
| Bar
data D1 :: K -> Type where
F1 :: D1 Foo
B1 :: D1 Bar
class C (a :: K -> Type) where
data D2 a :: K -> Type
foo :: a k -> D2 a k -> Bool
instance C D1 where
data D2 D1 k where
F2 :: D2 D1 Foo
B2 :: D2 D1 Bar
foo F1 F2 = True
foo B1 B2 = True
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