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{-# OPTIONS_GHC -dcore-lint -fdefer-typed-holes #-}
module T12947 where
import qualified Control.Monad.Fail as Fail
newtype P m a = P { unP :: (a -> IO (m ())) -> IO (m ()) }
instance Functor (P m) where
instance Applicative (P m) where
instance Monad (P m) where
instance (Fail.MonadFail m) => Fail.MonadFail (P m) where
fail msg = ContT $ \ _ -> Fail.fail msg
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