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{-# LANGUAGE ScopedTypeVariables #-}
import Data.IORef
import Control.Exception
import Control.Monad
data Exc = Exc deriving Show
instance Exception Exc
-- Recursive instead of NOINLINE because of #17673
f :: Int -> Int -> IO ()
f 0 x = do
let true = sum [0..4] == 10
when true $ throwIO Exc
x `seq` return ()
f n x = f (n-1) (x+1)
main = f 1 (error "expensive computation") `catch` \(_ :: Exc) -> return ()
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