sub My::Filters::known { }
    sub My::Filters::forward;
    for my $string (qw[known unknown forward]) {
        warn $string if My::Filters->can($string);
    }

##</code><code>##

    sub My::Filters::known { }
    sub My::Filters::forward;
    sub My::Other::Filters::forward;
    for my $package (qw[My::Filters My::Other::Filters]) {
        for my $func (qw[known unknown forward]) {
            warn $package . '::' . $func if $package->can($func);
        }
    }