purescript-0.15.15: tests/purs/passing/EmptyDataDecls.purs

module Main where

import Prelude
import Test.Assert
import Effect.Console (log)

data Z
data S n

data ArrayBox n a = ArrayBox (Array a)

nil :: forall a. ArrayBox Z a
nil = ArrayBox []

cons' :: forall a n. a -> ArrayBox n a -> ArrayBox (S n) a
cons' x (ArrayBox xs) = ArrayBox $ append [x] xs

main = case cons' 1 $ cons' 2 $ cons' 3 nil of
         ArrayBox [1, 2, 3] -> log "Done"
         _ -> assert' "Failed" false