&gt; <i>or written in Perl 6 itself using half-baked Perl 6 to 5 converters</i><p><i>Oh, I don&#x27;t think that ever happened.</i><p>That might be a reference to viv, which was used to implement STD (cf <a href="http:&#x2F;&#x2F;perl6.org&#x2F;compilers&#x2F;std-viv" rel="nofollow">http:&#x2F;&#x2F;perl6.org&#x2F;compilers&#x2F;std-viv</a> ).<p><i>There was also the initial idea that Perl 6 could run Perl 5, but this is proving impossible.</i><p>Personally, if Rakudo ever starts outperforming Perl5 for practical workloads, I believe that idea might eventually be revisited.