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{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
{-# LANGUAGE UndecidableInstances,
MultiParamTypeClasses,
KindSignatures,
FlexibleInstances,
FunctionalDependencies #-}
module Storage.Hashed.Monad () where
import Control.Applicative (Applicative(..))
import Data.Kind (Type)
class Monad m => TreeRO m where
withDirectory :: (MonadError e m) => Int -> m a -> m a
expandTo :: (MonadError e m) => Int -> m Int
instance (Monad m, MonadError e m) => TreeRO (M m) where
expandTo = undefined
withDirectory dir _ = do
_ <- expandTo dir
undefined
data M (m :: Type -> Type) a
instance Functor (M m) where
fmap = undefined
instance Applicative (M m) where
pure = undefined
(<*>) = undefined
instance Monad m => Monad (M m) where
(>>=) = undefined
return = undefined
instance MonadError e m => MonadError e (M m)
class Monad m => MonadError e m | m -> e
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