until -package:numeric-prelude -package:streaming -package:yesod-paginator -package:Cabal -package:dimensional -package:hledger-web package:dunai -is:exact

untilE :: Monad m => MSF m a b -> MSF m b (Maybe e) -> MSF (ExceptT e m) a b
dunai Control.Monad.Trans.MSF.Except
Similar to Yampa's delayed switching. Loses a b in case of an exception.
untilMaybe :: Monad m => MSF m a b -> MSF m b Bool -> MSF (MaybeT m) a b
dunai Control.Monad.Trans.MSF.Maybe
Run the first msf until the second one produces True from the output of the first.