They&#x27;re probably talking about the new &quot;rules&quot; system: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Perl_6_rules" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Perl_6_rules</a>