{-# LANGUAGE NondecreasingIndentation #-}
module Main where
import Control.Monad

main :: IO ()
main
  = do when (2 > 1) $
         do putStrLn "a"
            putStrLn "b"
nestedDoBlocks
  = getChar >>=
      (\ c1 ->
         do getChar >>=
              (\ c2 -> do getChar >>= (\ c3 -> return [c1, c2, c3])))