Re: Four problems with Scheme 48 1.8

* Martin Ward [2009-07-15 11:40+0200] writes:

> I was hoping that there would be a simple way to define defmacro using
> define-syntax and syntax-rules, but I can't find one.

With explicit-renaming macros you could define defmacro as:

(define-syntax defmacro 
  (syntax-rules ()
    ((defmacro name args body ...)
     (define-syntax name 
       (lambda (form rename compare)
	 (apply (lambda args body ...)
		(cdr form)))))))

(defmacro when (test . body) `(cond (,test . ,body)))

Ignore the renaming junk and viola: defmacro.

Helmut