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Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers

To: Jim Rees <jimreesma@x>
Subject: Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
From: Andy Wingo <wingo@x>
Date: Thu, 12 May 2011 16:32:05 +0200
Cc: scheme-reports@x
In-reply-to: <BANLkTikZt6w3oXcpwNYoiEjXkoZGs65fsg@mail.gmail.com> (Jim Rees's message of "Thu, 12 May 2011 08:36:53 -0400")
References: <m3sjsl4nkd.fsf@unquote.localdomain> <BANLkTik84AVk5TbL=iAT-YYZpe05+QoO2w@mail.gmail.com> <m3fwol4hcv.fsf@unquote.localdomain> <BANLkTikYYcFWeCX3ZYHeKooO+N7pU7Ap2g@mail.gmail.com> <4DCA7950.1040500@snell-pym.org.uk> <20110511152502.GO28086@frohike.homeunix.org> <m339kl43yg.fsf@unquote.localdomain> <20110511162654.GP28086@frohike.homeunix.org> <m3y62c2xc2.fsf@unquote.localdomain> <BANLkTin+0O0t6o7ytFHcS+6smZpJ+vn2_Q@mail.gmail.com> <4DCBA801.5020502@snell-pym.org.uk> <m38vuc2oel.fsf@unquote.localdomain> <4DCBC652.9020504@snell-pym.org.uk> <BANLkTikZt6w3oXcpwNYoiEjXkoZGs65fsg@mail.gmail.com>

On Thu 12 May 2011 14:36, Jim Rees <jimreesma@x> writes:

> On Thu, May 12, 2011 at 7:36 AM, Alaric Snell-Pym <alaric@x> wrote:
>
>     But what happens if you try to REVERSE a syntax-object wrapping a list?
>     You can't - 
>
> Overall your essay is illuminating, but reversing a syntax-object
> representing a list is easy in an R6RS-conforming implementation.
>
> (define (reverse-wrapped-list obj)
>   (syntax-case obj ()
>     ((e ...) (reverse #'(e ...)))))

This works on psyntax systems, where lists are never wrapped, but AFAIK
it does not work on Racket, where lists are wrapped.

Andy
-- 
http://wingolog.org/

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Follow-Ups:
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Alaric Snell-Pym <alaric@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: "Aaron W. Hsu" <arcfide@x>

References:
- [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Andy Wingo <wingo@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Alex Shinn <alexshinn@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Andy Wingo <wingo@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Alex Shinn <alexshinn@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Alaric Snell-Pym <alaric@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Peter Bex <Peter.Bex@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Andy Wingo <wingo@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Peter Bex <Peter.Bex@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Andy Wingo <wingo@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Alex Shinn <alexshinn@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Alaric Snell-Pym <alaric@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Andy Wingo <wingo@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Alaric Snell-Pym <alaric@x>
- Re: [Scheme-reports] [wg2] in support of single-arity procedural syntax transformers
  - From: Jim Rees <jimreesma@x>

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