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Re: Problem with cond macro.
From: |
Dirk Herrmann |
Subject: |
Re: Problem with cond macro. |
Date: |
Thu, 25 Apr 2002 23:59:31 +0200 (MEST) |
On Wed, 17 Apr 2002, Keith Wright wrote:
> > From: address@hidden (Julian v. Bock)
> >
> > >>>>> "PV" == Panagiotis Vossos <address@hidden> writes:
> >
> > PV> Ok, I just started studying macros, so I might be missing
> > PV> something obvious, but the following example from r5rs doesn't
> > PV> work correctly with guile:
> >
> > guile> (let ((=> #f))
> > guile> (cond (#t => 'ok)))
> > guile> In expression (cond (#t => #)):
> > guile> Wrong type to apply: ok ABORT:
[...]
> R5RS> As an example. if LET and COND are defined as in section 7.3
> R5RS> then they are hygenic (as required) and the following is
> R5RS> not an error.
> R5RS> <above example>
>
> I take this to mean that the behaviour shown is required, and
> that furthermore the hygenic macro system exhibits the required
> behaviour. Thus the built-in COND should work in the same
> way as the example implementation given in the R5 Report,
> even though it may be implemented more (or less) efficiently.
Well, I'm not sure I understand all of this: What about the following:
(define => #f)
(cond (#t => 'ok))
Should this also deliver 'ok ? It doesn't seem to with the current
implementation of syncase.
Best regards,
Dirk Herrmann
- Problem with cond macro., Panagiotis Vossos, 2002/04/15
- Re: Problem with cond macro., Julian v. Bock, 2002/04/16
- Re: Problem with cond macro., Panagiotis Vossos, 2002/04/16
- Re: Problem with cond macro., Julian v. Bock, 2002/04/16
- Re: Problem with cond macro., Joshua Judson Rosen, 2002/04/16
- Re: Problem with cond macro., Panagiotis Vossos, 2002/04/16
- Re: Problem with cond macro., Neil Jerram, 2002/04/17
- Re: Problem with cond macro., Neil Jerram, 2002/04/20
- Re: Problem with cond macro., Neil Jerram, 2002/04/20
Re: Problem with cond macro., Keith Wright, 2002/04/17