until -package:numeric-prelude -package:language-bash -package:clash-prelude -package:dimensional -package:extra -package:hledger-web -package:Cabal -package:protolude -is:exact -package:linear-base 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.