GPT-5 Problem

gpt5.hs

module Main
( main
) where 


-- | Reverse a list. 
-- 
-- Subject to the following laws: 
-- 
-- * reverse' . reverse' = id
--
reverse' :: [a] -> [a]
reverse' x = undefined

-- | Implement reverse' such that main both compiles and produces values. 
--  
-- Hint: use laziness to your advantage. Define an auxiliary function, say, 
-- 
-- `reverse'' :: Int -> [a] -> [a] -> [a]`
-- 
-- that can recurse along in finite chunks of size `n`, weaving `take` and `drop` values 
-- into an accumulator. 
-- 
main :: IO ()
main = do
  print $ reverse' $ [1..10]
  print $ length . take 1 . reverse' . reverse' $ [1..]
  print $ length . take 50000 . reverse' . reverse' $ [1..]