until -package:numeric-prelude -package:util -package:xmonad-contrib -package:LambdaHack -package:mixed-types-num -package:rebase -is:exact -package:distribution-opensuse -package:hledger-web package:dunai -is:exact
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.