[racket] How to handle #??? from #%declare

That should have been an error instead of a successful expansion. I've
pushed a repair.

At Sat, 1 Mar 2014 12:25:48 -0500, Asumu Takikawa wrote:
> Hi all,
> 
> I have a question about the recently added #%declare form for modules.
> Here's an example expansion for context:
> 
>   -> (syntax->datum (expand #'(module a racket (#%declare "something"))))
>   '(module a racket
>      (#%module-begin
>       (module configure-runtime '#%kernel
>         (#%module-begin (#%require racket/runtime-config) (#%app configure 
> '#f)))
>       #???))
> 
> It appears that an invalid(?) #%declare form gets expanded to a #???.
> This object is apparently not a symbol, so is there any sensible way to
> handle one of these in a macro that inspects a whole module?
> 
> Cheers,
> Asumu
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