until -package:numeric-prelude -package:streaming -package:util -package:snap-core -package:basic-prelude -package:linear-base -package:dunai -package:monad-loops -package:singletons-base 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.