:: Ord a => [a] -> [a] -package:html-entities -package:extra -package:amazonka-core -package:errors -package:imports -package:ghc -package:incipit-base -package:hedgehog is:exact -package:generic-deriving -package:Cabal-syntax -package:Cabal 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.