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Haskell Quiz/FizzBuzz/Solution Heisenbug

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 {-# LANGUAGE LambdaCase #-}
 main = mapM_ (putStrLn . fizzbuzz) [1 .. 100]
   where fizzbuzz n = (\case "" -> show n; fb -> fb)
                        (concat $ ["fizz" | n `rem` 3 == 0] ++ ["buzz" | n `rem` 5 == 0])