[gambit-list] Intermixing syntax-rules and define-macro

Mikael mikael.rcv at gmail.com
Thu Sep 27 19:45:02 EDT 2012


Black Hole provides this with an pretty-much-as-well-as-can-be-done quality.

2012/9/28 Patrick Li <patrickli.2001 at gmail.com>

> Hello,
>
> I am having some issues with the subtleties of the low-level define-macro
> system. The problem seems to be that the identifiers created by
> syntax-rules are not equivalent to the identifiers created by define-macro.
> I would really appreciate some help on this.
>
> Here is a small example:
>
> (define-syntax multi-let
>   (syntax-rules ()
>     ((multi-let (vars ...) body ...)
>      (let* [(vars '()) ...] ;; Declare the variables
>        ($set vars) ...    ;; Set them to "initial"
>        body ...))))
>
> (define-macro ($set var)
>   `(set! ,var "initial"))   ;; Set the variable to "initial"
>
>
> And here is what happens when I try to use it:
> > (multi-let (x y z) x)
> *** ERROR IN #<procedure #2> -- Unbound variable: x
>
> Thank you very much! For my use case, I am unable to stick completely to
> using define-syntax thus have to deal with how to intermix these two
> systems properly.
>    -Patrick
>
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>
>
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