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{-# LANGUAGE DeriveDataTypeable #-}
module T3983_Bar where
import Data.Dynamic
import Control.Exception
import Control.Monad (unless)
type Assertion = IO ()
data X = X String deriving (Show, Typeable)
instance Exception X
throwX = throw.X
catchX action = do { action; return True; } `catches` [Handler (\(X _) -> return False)]
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