// longer slice starting at the same point in the input.
//
// The function is never called with an empty data slice unless atEOF
// is true. If atEOF is true, however, data may be non-empty and,
// as always, holds unprocessed text.
type SplitFunc func(data []byte, atEOF bool) (advance int, token []byte, err error)

// Errors returned by Scanner.
var (
	ErrTooLong         = errors.New("bufio.Scanner: token too long")

		var current metaCacheEntry
		var atEOF, fnf, vnf, hasErr, agree int
		for i := range topEntries {
			topEntries[i] = metaCacheEntry{}
		}
		if contextCanceled(ctx) {
			return ctx.Err()
		}
		for i, r := range readers {
			if errs[i] != nil {
				hasErr++
				continue
			}
			entry, err := r.peek()
			switch err {
			case io.EOF:
				atEOF++
				continue
			case nil: