:: Ord a => [a] -> [a] -package:witherable -package:Cabal-syntax -package:ghc -package:errors -is:exact is:exact -package:Cabal -package:containers -package:hedgehog -package:hxt -package:mono-traversable 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.