Hi Alex,
Alex Shinn skribis:
> This is not a bug. R5RS states:
>
> The keyword at the beginning of the pattern in a is
> not involved in the matching and is not considered a pattern
> variable or literal identifier.
>
> R6RS forbids _ as a literal. R7RS retains the R5RS ignorin
On Thu, Oct 11, 2012 at 5:41 AM, Ludovic Courtès wrote:
> Hi,
>
> Mark H Weaver skribis:
>
>> Unfortunately, preserving the macro keyword breaks one of Oleg
>> Kiselyov's macros, namely 'ppat' in system/base/pmatch.scm:
>
> [...]
>
>> Oleg's macro uses '_' in the keyword position of the pattern,
l...@gnu.org (Ludovic Courtès) writes:
> Mark H Weaver skribis:
>
>> Unfortunately, preserving the macro keyword breaks one of Oleg
>> Kiselyov's macros, namely 'ppat' in system/base/pmatch.scm:
>
> [...]
>
>> Oleg's macro uses '_' in the keyword position of the pattern, even
>> though '_' is in
Hi,
Mark H Weaver skribis:
> Unfortunately, preserving the macro keyword breaks one of Oleg
> Kiselyov's macros, namely 'ppat' in system/base/pmatch.scm:
[...]
> Oleg's macro uses '_' in the keyword position of the pattern, even
> though '_' is in the literals list. Therefore, it fails to mat
Unfortunately, preserving the macro keyword breaks one of Oleg
Kiselyov's macros, namely 'ppat' in system/base/pmatch.scm:
--8<---cut here---start->8---
(define-syntax ppat
(syntax-rules (_ quote unquote)
((_ v _ kt kf) kt)
((_ v () kt kf) (if (null? v
Hi Mark!
Makes sense to me, you can apply it.
Thanks,
Ludo’.
Hello all,
I'd like to be able to do things like this:
--8<---cut here---start->8---
(define-syntax alt-environment
(syntax-rules ()
((alt-environment)
(the-environment alt-environment
--8<---cut here---end--->
