until -package:numeric-prelude -package:base-prelude -package:distribution-opensuse -package:Cabal -package:numhask -package:intro -package:monad-loops -package:utility-ht -package:elerea -package:IfElse -package:faktory package:selective
Keep running an effectful computation until it returns a
Right value, collecting the Left's using a supplied
Monoid instance.