until -package:numeric-prelude -package:yesod-paginator -package:prelude-compat -package:numhask -package:hosc -package:free -package:utility-ht -package:language-bash -package:netwire -package:faktory -package:selective package:dunai
Similar to Yampa's delayed switching. Loses a b in case of an
exception.
Run the first
msf until the second one produces
True
from the output of the first.