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{-# LANGUAGE DataKinds, DatatypeContexts, MagicHash, UnliftedNewtypes, TypeFamilies #-}
module T21650_a where
import Data.Kind
import GHC.Exts
type R :: Type -> RuntimeRep
type family R a where
R Float = FloatRep
R Double = DoubleRep
type F :: forall (a :: Type) -> TYPE (R a)
type family F a where
F Float = Float#
F Double = Double#
type C :: Type -> Constraint
class C a where {}
type N :: forall (a :: Type) -> TYPE (R a)
newtype C a => N a = MkN (F a)
foo1 :: C Float => F Float -> N Float
foo1 = MkN
foo2 :: C Double => () -> F Double -> N Double
foo2 _ = MkN
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