package Letrecmodx(sysLetrecmodx) where

import List

-- sometimes function arguments are OK, sometimes not.
-- It's generally unpredictable, due to whether rewriting
-- into point-free form occurs.
seven :: Integer
seven = let evens :: Integer -> List Integer
            evens x = cons x (map ((+) 1) odds)
            odds  :: List Integer = map ((+) 1) (evens 0)
        in odds !! 3

sysLetrecmodx :: Module Empty
sysLetrecmodx =
  module
    rules
      when True ==>
         action
            $display seven
            $finish 0