return fmt.Sprintf(`Too long: your last line for this <input> was %d bytes,
over the %d-byte limit. Write the whole line again, cutting just
enough of the least valuable items to fit before this cut:
-%s| ← LIMIT`, len(line), nodeBytes, cutLine(line))
+%s| <- LIMIT`, len(line), nodeBytes, cutLine(line))
}
// cutLine returns the first nodeBytes bytes of line, without a part of a