my $cat = popen_rd(['cat', $o]);
ok(!lei(qw(q --import-before bogus -o), "mboxrd:$o"),
'--import-before fails on non-seekable output');
+ like($lei_err, qr/not seekable/, 'unseekable noted in error');
is(do { local $/; <$cat> }, '', 'no output on FIFO');
close $cat;
$cat = popen_rd(['cat', $o]);