:: Ord a => [a] -> [a] -package:containers -package:ghc -package:basement -package:imports -package:amazonka-core -package:Cabal -package:extra -package:lifted-base -package:hedgehog -is:exact package:parsers is:exact
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.