until -package:numeric-prelude -package:base-prelude -package:distribution-opensuse -package:Cabal -package:streaming -is:exact -package:snap-core -package:elerea -package:scalpel-core -package:hledger-web package:utility-ht is:exact

until :: Monad m => (a -> Bool) -> m a -> m a
utility-ht Control.Monad.HT
repeat action until result fulfills condition