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{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE GADTs #-}
-- This test uses the PushC rule of the System FC operational semantics
-- Written by Tom Schrijvers
module CoTest3 where
data T a = K (a ~ Int => a -> Int)
{-# INLINE[2] f #-}
f :: T s1 ~ T s2 => T s1 -> T s2
f x = x
{-# INLINE[3] test #-}
test :: T s1 ~ T s2 => (s1 ~ Int => s1 -> Int) -> (s2 ~ Int => s2 -> Int)
test g = case f (K g) of
K r -> r
e :: s ~ Int => s -> s -> Int
e _ s = s
final :: s1 ~ s2 => s1 -> (s2 ~ Int => s2 -> Int)
final x = test (e x)
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