[plt-scheme] Macros that expand to macro definitions

Arjun Guha wrote:
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> 
> This (contrived) example doesn't work:
> 
>   (define-syntax (foo stx)
>     (syntax-case stx ()
>       [(_ foo-expr ...)
>        #`(begin
> 
>            (define-syntax (bar stx)
>              (syntax-case stx ()
>                [(_ (bar-expr ...))
>                 #'(begin
>                     (printf "~a~n" 'bar-expr) ...)]))
> 
>            (bar foo-expr) ...)]))
> 
> I get:
> 
> Welcome to DrScheme, version 299.106-svn16jun2005.
> Language: (module ...).
> syntax: no pattern variables before ellipses in template in: ...
> 
>>
> 
> However, if I remove the ellipses, so that the pattern for the inner bar 
> macro is (_ (bar-expr)), it works just fine.  Is there any way to use 
> ... in bar?

You need to write them as (... ...).

-- 
Jens Axel Søgaard