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{-# LANGUAGE CPP #-}
module Text.Pandoc.Compat.Except ( ExceptT
, Error(..)
, runExceptT
, throwError
, catchError )
where
#if MIN_VERSION_mtl(2,2,1)
import Control.Monad.Except
class Error a where
noMsg :: a
strMsg :: String -> a
noMsg = strMsg ""
strMsg _ = noMsg
#else
import Control.Monad.Error
type ExceptT = ErrorT
runExceptT :: ExceptT e m a -> m (Either e a)
runExceptT = runErrorT
#endif
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