:: Ord a => [a] -> [a] -package:html-entities is:exact -package:extra -package:containers -package:amazonka-core -package:integration -package:ghc -package:safe -package:witherable -package:generic-deriving -package:hxt -package:vector 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.