eval 'package EmptyInbox; sub smsg_by_mid { undef }';
my $ctx = { ibx => bless {}, 'EmptyInbox' };
my $rootset = PublicInbox::SearchThread::thread($smsgs, sub {
eval 'package EmptyInbox; sub smsg_by_mid { undef }';
my $ctx = { ibx => bless {}, 'EmptyInbox' };
my $rootset = PublicInbox::SearchThread::thread($smsgs, sub {