until -package:numeric-prelude -package:yesod-paginator -package:prelude-compat -package:numhask -package:hosc -package:monad-loops -package:utility-ht -package:singletons-base -package:streaming package:filepath

findFromEndUntil :: (Word16 -> Bool) -> ShortByteString -> Int
filepath System.OsPath.Data.ByteString.Short.Internal
Returns the length of the substring matching, not the index. If no match, returns 0.