import Outputable
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
-- Detection of available libraries
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
-- we don't depend on MTL for now
#define HAVE_MTL 0
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
-- Imports
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
import Maybes
import Control.Monad
import Control.Monad.Fix
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
-- The ID monad
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
newtype ID a = ID a
instance Monad ID where
runID :: ID a -> a
runID (ID x) = x
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
-- MTL
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
#if !HAVE_MTL
instance MonadIO IO where liftIO = id
#endif
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
-- Lift combinators
-- These are used throughout the compiler
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
-- | Lift an 'IO' operation with 1 argument into another monad
liftIO1 :: MonadIO m => (a -> IO b) -> a -> m b
liftIO4 :: MonadIO m => (a -> b -> c -> d -> IO e) -> a -> b -> c -> d -> m e
liftIO4 = (((.).(.)).((.).(.))) liftIO
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
-- Common functions
-- These are used throughout the compiler
-----------------------------------------------------------------------------------------
+-------------------------------------------------------------------------------
zipWith3M :: Monad m => (a -> b -> c -> m d) -> [a] -> [b] -> [c] -> m [d]
zipWith3M _ [] _ _ = return []