Commit 12121213 authored by Petr Pudlak's avatar Petr Pudlak
Browse files

Add a MonadLog instance for strict variant of RWS

This allows to log in monad stacks containing RWS.
Signed-off-by: default avatarPetr Pudlak <>
Reviewed-by: default avatarKlaus Aehlig <>
parent 9515a7d2
......@@ -54,6 +54,8 @@ import Control.Applicative ((<$>))
import Control.Monad
import Control.Monad.Error (Error(..), MonadError(..), catchError)
import Control.Monad.Reader
import qualified Control.Monad.RWS.Strict as RWSS
import Data.Monoid
import System.Log.Logger
import System.Log.Handler.Simple
import System.Log.Handler.Syslog
......@@ -142,6 +144,9 @@ instance MonadLog IO where
instance (MonadLog m) => MonadLog (ReaderT r m) where
logAt p = lift . logAt p
instance (MonadLog m, Monoid w) => MonadLog (RWSS.RWST r w s m) where
logAt p = lift . logAt p
instance (MonadLog m, Error e) => MonadLog (ResultT e m) where
logAt p = lift . logAt p
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