{-# LANGUAGE TypeOperators, DeriveGeneric #-}

module Main where

import GHC.Generics hiding (C, D)
import GEq

-- We should be able to generate a generic representation for these types

data C = C0 | C1
  deriving Generic

data D a = D0 | D1 { d11 :: a, d12 :: (D a) }
  deriving Generic

data (:**:) a b = a :**: b
  deriving Generic

-- Example values
c0 = C0
c1 = C1

d0 :: D Char
d0 = D0
d1 = D1 'p' D0

p1 :: Int :**: Char
p1 = 3 :**: 'p'

-- Generic instances
instance                   GEq C
instance (GEq a)        => GEq (D a)
instance (GEq a, GEq b) => GEq (a :**: b)

-- Tests
teq0 = geq c0 c1
teq1 = geq d0 d1
teq2 = geq d0 d0
teq3 = geq p1 p1

main = mapM_ print [teq0, teq1, teq2, teq3]