my $cat = popen_rd(['cat', $o]);
ok(!lei(qw(q --import-before bogus -o), "mboxrd:$o"),
'--import-before fails on non-seekable output');
my $cat = popen_rd(['cat', $o]);
ok(!lei(qw(q --import-before bogus -o), "mboxrd:$o"),
'--import-before fails on non-seekable output');