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{-# LANGUAGE Rank2Types, TypeSynonymInstances, FlexibleInstances #-}
{-# LANGUAGE TypeFamilies, GeneralizedNewtypeDeriving #-}
module Bug2 where
newtype ReaderT r m a = ReaderT { runReaderT :: r -> m a }
instance (Monad m) => Monad (ReaderT r m) where
return a = ReaderT $ \_ -> return a
m >>= k = ReaderT $ \r -> do
a <- runReaderT m r
runReaderT (k a) r
fail msg = ReaderT $ \_ -> fail msg
newtype ResourceT r s m v = ResourceT { unResourceT :: ReaderT r m v }
deriving (Monad)
data Ctx = Ctx
data Ch = Ch
type CAT s c = ResourceT [Ch] (s,c)
type CtxM c = ResourceT Ctx c IO
newtype CA s c v = CA { unCA :: CAT s c (CtxM c) v }
deriving (Monad)
class (Monad m) => MonadCA m where
type CtxLabel m
instance MonadCA (CA s c) where
type CtxLabel (CA s c) = c
instance (Monad m, MonadCA m, c ~ CtxLabel m) => MonadCA (CAT s c m) where
type CtxLabel (CAT s c m) = c
runCAT :: (forall s. CAT s c m v) -> m v
runCAT action = runReaderT (unResourceT action) []
newRgn :: MonadCA m => (forall s. CAT s (CtxLabel m) m v) -> m v
newRgn = runCAT
runCA :: (forall s c. CA s c v) -> IO v
runCA action = runCtxM (runCAT (unCA action))
runCtxM :: (forall c. CtxM c v) -> IO v
runCtxM action = runReaderT (unResourceT action) Ctx
-- test11 :: IO ()
-- test11 = runCA(newRgn(newRgn(newRgn(newRgn(newRgn(
-- newRgn(newRgn(newRgn(newRgn(return()))))))))))
-- test12 :: IO ()
-- test12 = runCA(newRgn(newRgn(newRgn(newRgn(newRgn(newRgn(
-- newRgn(newRgn(newRgn(newRgn(return())))))))))))
-- test13 :: IO ()
-- test13 = runCA(newRgn(newRgn(newRgn(newRgn(newRgn(newRgn(newRgn(
-- newRgn(newRgn(newRgn(newRgn(return()))))))))))))
test14 :: IO ()
test14 = runCA(newRgn(newRgn(newRgn(newRgn(newRgn(newRgn(newRgn(newRgn(
newRgn(newRgn(newRgn(newRgn(return())))))))))))))
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