[CM] Performance of S7

[bil at ccrma.Stanford.EDU]

I think the problem here is with-let -- it is blocking
the normal optimizations that would otherwise speed
up fib.  Here is an ugly substitute:

(let ((temp-value #f))
     (define *texmacs-module* (curlet))
     (define-macro (tm-define head . body)
       `(eval (list 'define ',head ', at body) *texmacs-module*))

     (let ()
         (tm-define fib (lambda (n) (if (< n 2) n (+ (fib (- n 1)) (fib 
(- n 2)))))))

     (let ((n 40))
         (format *stdout* "(fib ~A) : ~A \n" n (fib n))))

There has to be a prettier way to do it!

with-let should not be so paranoid...