Leaky program

leaky.hs

{-# Language TupleSections #-}

import System.Random
import Data.Map (fromListWith,Map)
import Control.Arrow

randomStream 0 g = ([],g)
randomStream n g = (a:as,g'') where
  (a,g')   = randomR (0,100) g
  (as,g'') = randomStream (n-1) g'

makeStats :: Int -> StdGen -> (Map Int Int, StdGen)
makeStats n g = first (fromListWith (+) . map (,1)) $ randomStream n g

main =  getStdGen >>= print . makeStats 10000000