> However with CL and most of the popular "modern lisps" When I write, 'modern Lisp' I mean 'modern implementation of Common Lisp,' since there is no Lisp but

> However with CL and most of the popular "modern lisps" When I write, 'modern Lisp' I mean 'modern implementation of Common Lisp,' since there is no Lisp but Common Lisp, and Kent Pitman is its editor:-) SBCL, at least, provides some support for stack allocation, and I'd be surprised if Allegro and LispWorks don't. Like I wrote, modern Lisps tend to be fast enough, albeit not as fast as would be perfect.