until -package:numeric-prelude -package:language-bash -package:clash-prelude -package:extra -package:free -package:elerea -package:ghc-lib-parser -package:hledger-web -package:numhask -package:basic-prelude -package:hosc 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.