:: Ord a => [a] -> [a] is:exact -package:Glob -package:extra -package:lifted-base -package:mono-traversable -package:witherable -package:statistics -package:ghc -package:basement -package:amazonka-core -package:vector -package:integration 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.