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onLeft :: forall e m a. Monad m => (e -> m a) -> Either e a -> m a

onNothing :: forall a m. Monad m => m a -> Maybe a -> m a

onLeftM :: forall e m a. Monad m => (e -> m a) -> m (Either e a) -> m a

onNothingM :: forall a m. Monad m => m a -> m (Maybe a) -> m a