until -package:numeric-prelude -package:language-bash -package:clash-prelude -package:mixed-types-num -package:netwire -package:hledger-web -package:base -package:Cabal -package:base-compat -package:IfElse 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.