until -package:numeric-prelude -package:util -package:xmonad-contrib -package:base-compat -package:mixed-types-num -package:dimensional -package:faktory -package:foundation -package:classy-prelude -package:ghc-lib-parser 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.