:: Ord a => [a] -> [a] -package:primitive-extras -package:mono-traversable -package:Cabal -package:ghc -package:witherable -package:containers -package:Cabal-syntax is:exact -package:integration -package:lifted-base 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.