until -package:numeric-prelude -package:base-prelude -package:distribution-opensuse -package:extra -package:rebase is:exact -package:intro -package:ghc -package:termonad -package:Cabal-syntax package:utility-ht

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