:: Ord a => [a] -> [a] -package:witherable -package:containers -package:extra -package:mono-traversable -is:exact -package:errors -package:amazonka-core -package:lifted-base -package:lens -package:statistics -package:generic-deriving package:parsers
Take a parser that may consume input, and on failure, go back to where
we started and fail as if we didn't consume input.