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I often use expressions of the form maybe (return ()) someFunc someMaybe.
Searching for a function Monad m => (a -> m ()) -> Maybe a -> m () on hoogle doesn’t yield a specific result. Isn’t there any library function for this?
You can use
mapM_orforM_from Data.Foldable for this. See also the recent discussion on the librariers mailing list.