ContentsIndex
Org.Org.Semantic.HBase.Category.MonadHasNothing
Synopsis
class Monad m => MonadHasNothing m a where
getNothing :: m a
class MonadHasNothing m a => MonadHasNothingKnown m a where
getIsNothing :: a -> m Bool
failIfNothing :: MonadHasNothingKnown m a => String -> a -> m ()
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