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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE QuantifiedConstraints #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TypeOperators #-}
module Data where
data SList f l where
SNil :: SList f '[]
SCons :: f a -> SList f l -> SList f (a : l)
deriving instance (forall a. Show (f a)) => Show (SList f l)
infixr `SCons`
slistMap :: (forall t. f t -> g t) -> SList f list -> SList g list
slistMap _ SNil = SNil
slistMap f (SCons x list) = SCons (f x) (slistMap f list)
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