[racket] Using ... as a keyword in syntax-rules

On 1/13/12 3:45 PM, Patrick Li wrote:
> Hello everyone,
>
> I'm trying to write a simple macro using syntax-rules, and couldn't find
> an answer to this problem in the faqs. If I want to use '... as a
> keyword for matching in syntax-rules, how would I do this? I've tried
> various combinations of (...) and (... ...), etc... but couldn't get it
> to work.

#lang racket
(define-syntax is-dots?
   (syntax-rules (... ...)
     [(is-dots? (... ...)) #t]
     [(is-dots? _) #f]))

(is-dots? ...)
(is-dots? dots)