As much as I love a good Greenspun invocation, I don&#x27;t think this really counts:<p>&gt; Any sufficiently complicated C or Fortran program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp.<p>isn&#x27;t about the inevitability of literally implementing a Lisp interpreter.<p>It&#x27;s about something more abstract.  see: <a href="http:&#x2F;&#x2F;c2.com&#x2F;cgi-bin&#x2F;wiki?LevelsOfGreenspunning" rel="nofollow">http:&#x2F;&#x2F;c2.com&#x2F;cgi-bin&#x2F;wiki?LevelsOfGreenspunning</a>