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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TemplateHaskell #-}
module T14931_Bug where
import Prelude (Int, IO, Bool(..), Num(..), Monad(..), not, print)
import qualified Language.Haskell.TH.Syntax as TH
import T14931_State
wat :: IO ()
wat = print $(let playGame [] = do
(_, score) <- get
return score
playGame (x:xs) = do
(on, score) <- get
case x of
'a' | on -> put (on, score + 1)
'b' | on -> put (on, score - 1)
'c' -> put (not on, score)
_ -> put (on, score)
playGame xs
startState :: (Bool, Int)
startState = (False, 0)
in TH.lift (evalState (playGame "abcaaacbbcabbab") startState) )
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