:: Ord a => [a] -> [a] -package:html-entities -package:lens -package:containers -package:safe -package:imports -is:exact -package:lifted-base -package:integration -package:ghc -package:hedgehog -is:exact -package:errors 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.