Re: Can a macro define a macro?

Pascal Costanza wrote:

For example, why don't you just write this?
 
(defun powersn (x n)
   (loop for i from to n collecting (expt x i)))

Rejected by SBCL:

; in: LAMBDA NIL
;     (LOOP FOR I FROM TO N
;           COLLECTING (EXPT X I))
;
; caught ERROR:
;   (in macroexpansion of (LOOP FOR I ...))
;   (hint: For more precise location, try *BREAK-ON-SIGNALS*.)
;   unknown LOOP keyword: N
;   current LOOP context: N COLLECTING.

Gauche Scheme.

(define (powersn x n)
  (map (cut  expt x <>) (liota n 1)))


(powersn 3 5)
  ===>
(3 9 27 81 243)