module Deptup0 () where

import Language.Haskell.Liquid.Prelude

{-@ data Pair a b <p :: x0:a -> x1:b -> Bool> = P {pX :: a, pY :: b<p pX> } @-}
data Pair a b = P a b


{-- TODO: mkP :: forall a b <p :: a -> b -> Bool>. x: a -> y: b<p x> -> Pair <p> a b  --}

mkP :: a -> a -> Pair a a
mkP x y = P x y

incr x = x + 1

baz x  = mkP x (incr x)

chk (P x y) = liquidAssertB (x < y)

prop = chk $ baz n
  where n = choose 100


bazList  xs = map baz xs

n           = choose 0

xs          = [0,1,2,3,4]

prop_baz    = map chk $ bazList xs