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Control.Monad.Maybe
Documentation
data MaybeT m a
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MonadTrans MaybeT
MonadReader r m => MonadReader r (MaybeT m)
MonadState s m => MonadState s (MaybeT m)
(Monoid w, MonadWriter w m) => MonadWriter w (MaybeT m)
Functor m => Functor (MaybeT m)
Monad m => Monad (MaybeT m)
MonadIO m => MonadIO (MaybeT m)
Monad m => MonadPlus (MaybeT m)
runMaybeT :: MaybeT m a -> m (Maybe a)
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