With Perl 5.12 comes a working test example already using the pluggable feature: http://search.cpan.org/dist/perl/ext/XS-APItest-KeywordRPN/KeywordRPN.pm http:/

With Perl 5.12 comes a working test example already using the pluggable feature: http://search.cpan.org/dist/perl/ext/XS-APItest-KeywordRPN/KeywordRPN.pm http://search.cpan.org/dist/perl/ext/XS-APItest-KeywordRPN/K... Here is the code example from the docs: use XS::APItest::KeywordRPN qw(rpn calcrpn); $triangle = rpn($n $n 1 + * 2 /); calcrpn $triangle { $n $n 1 + * 2 / }