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  1. mylength :: [Int] -> Int
  2. mylength l = foldr f 0 l
  3. where
  4. f :: Int -> Int -> Int
  5. f x y = y+1
  6.  
  7.  
  8. main :: IO ()
  9. main = print (mylength [1,2,3,4])
Success #stdin #stdout 0s 4392KB
stdin
Standard input is empty
stdout
4