Re: Enhancement to the syntax system?

[Marijn <hkBst@gentoo.org>]

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Hi Stefan,

On 03-07-12 23:52, Stefan Israelsson Tampe wrote:
> You do not need gensyms if you try to mimic or implement my
> suggested #. . On the other hand when if you do this
> 
> (define (f stx) #`(let ((x 1)) #,stx))
> 
> and use this with
> 
> #`(let ((x 2)) #,(f #'x))
> 
> the resulting expanded code would produce 1 which is not what you
> want.

I tried it in Racket:


(define-for-syntax (f stx) #`(let ((x 1)) #,stx))

(define-syntax (m stx)
  (syntax-case stx ()
    ((_) #`(let ((x 2)) #,(f #'x))) ))

(m)


but I get error messages which I don't know what to do about. Do you
have running examples of code not producing the result you want?

Marijn
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