PublicInbox::MboxReader->$fmt($rd, \&_mbox_augment_kw_maybe,
$lei, $lse, $opt->{augment});
if (!$opt->{augment} and !truncate($out, 0)) {
PublicInbox::MboxReader->$fmt($rd, \&_mbox_augment_kw_maybe,
$lei, $lse, $opt->{augment});
if (!$opt->{augment} and !truncate($out, 0)) {