until -package:numeric-prelude -package:yesod-paginator -package:prelude-compat -package:numhask -package:clash-prelude -package:ghc-lib-parser -package:base -package:conferer -package:hledger-web -package:monad-loops -package:selective 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.