Useful for resuming a parse that returns unconsumed data. Construct a Buffered.state by using Buffered.parse and provide it into this function. This is essentially what parse_many does, so consider using that if you don't require fine-grained control over how many times you want the parser to succeed.

Usage example:

  parse parser in_channel >>= fun (unconsumed, result) ->
  match result with
  | Ok a ->
    let { buf; off; len } = unconsumed in
    let state = Buffered.parse parser in
    let state = Buffered.feed state (`Bigstring (Bigstringaf.sub ~off ~len buf)) in
    with_buffered_parse_state state in_channel
  | Error err -> failwith err