ghc-mod/GHCChoice.hs
2012-02-16 14:44:20 +09:00

26 lines
566 B
Haskell

{-# LANGUAGE ScopedTypeVariables #-}
module GHCChoice where
import Control.Exception
import CoreMonad
import Exception
import GHC
----------------------------------------------------------------
(||>) :: Ghc a -> Ghc a -> Ghc a
x ||> y = x `gcatch` (\(_ :: IOException) -> y)
----------------------------------------------------------------
{-| Go to the next 'Ghc' monad by throwing 'AltGhcgoNext'.
-}
goNext :: Ghc a
goNext = liftIO . throwIO $ userError "goNext"
{-| Run any one 'Ghc' monad.
-}
runAnyOne :: [Ghc a] -> Ghc a
runAnyOne = foldr (||>) goNext