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

    sub My::Filters::known { }
    sub My::Filters::forward;
...
            warn $package . '::' . $func if $package->can($func);
        }
    }