> "Any sufficiently complicated program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp." I have never seen th

> "Any sufficiently complicated program contains an ad hoc, informally-specified, bug-ridden, slow implementation of half of Common Lisp." I have never seen that in practice (30+ years of industry experience working on very large applications). I think it is one of those statements that fans of Lisp love to quote (a lot) without having any empirical data to back it up. And yes I am sure that there are examples out there. You can probably find examples of anything if you look hard enough. But that doesn't make it a general rule.