:: Ord a => [a] -> [a] is:exact -package:primitive-extras -package:witherable -package:amazonka-core -package:base-prelude -package:lens -package:errors -package:safe -package:ghc -package:containers -package:Cabal -package:extra 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.