use IO::Handle;

print $^STDOUT, "1..6\n";
my $i = 1;
foreach (qw(SEEK_SET SEEK_CUR SEEK_END     _IOFBF    _IOLBF    _IONBF)) {
    my $d1 = defined(&{*{Symbol::fetch_glob("IO::Handle::" . $_)}}) ?? 1 !! 0;
    my $v1 = $d1 ?? &{*{Symbol::fetch_glob("IO::Handle::" . $_)}}() !! undef;
    my $v2 = IO::Handle::constant($_);
    my $d2 = defined($v2);

    print $^STDOUT, "not "
	if($d1 != $d2 || ($d1 && ($v1 != $v2)));
    print $^STDOUT, "ok ",$i++,"\n";
}