until -package:numeric-prelude -package:language-bash -package:clash-prelude -package:utility-ht -package:scalpel-core -is:exact -package:sparse-linear-algebra -package:monad-loops -package:cabal-install-solver -package:netwire 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.