module Net::IMAP::Authenticators

def add_authenticator(...)
  warn(
    "%s.%s is deprecated.  Use %s.%s instead." % [
      Net::IMAP, __method__, Net::IMAP::SASL, __method__
    ],
    uplevel: 1, category: :deprecated
  )
  Net::IMAP::SASL.add_authenticator(...)
end