until -package:numeric-prelude -package:language-bash -package:clash-prelude -package:utility-ht -package:scalpel-core -package:mixed-types-num -is:exact -package:protolude -package:yesod-paginator 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.