From: John Cowan <cowan@ccil.org>
To: Andy Wingo <wingo@pobox.com>
Cc: 38236@debbugs.gnu.org
Subject: bug#38236: R7RS reader does not support datum labels
Date: Sat, 16 Nov 2019 17:41:18 -0500 [thread overview]
Message-ID: <CAD2gp_Ro27o0Ez59hEUe3Wg4BzsGaQU6REFWau0vdCVvwKn_Tw@mail.gmail.com> (raw)
In-Reply-To: <87pnhrmtrc.fsf@pobox.com>
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I don't see where the incompatibility comes in, although more lookahead
would be required. Per the Guile documentation, neither #n# nor #n= (where
n is a sequence of digits) is a valid array tag.
On Sat, Nov 16, 2019 at 3:50 PM Andy Wingo <wingo@pobox.com> wrote:
> R7RS defines a lexical feature called "datum labels"; see section 2.4 in
> the report. An example would be:
>
> #0=(a b c . #0#)
>
> Guile's reader doesn't support this feature and it's not clear if we
> should, in general. Note, datum literals appear to be incompatible with
> array literals. But we could of course use the R7RS layer as a place to
> experiment with a `read' implemented in Scheme.
>
>
>
>
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next prev parent reply other threads:[~2019-11-16 22:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-16 20:49 bug#38236: R7RS reader does not support datum labels Andy Wingo
2019-11-16 22:41 ` John Cowan [this message]
2019-11-18 15:10 ` Mark H Weaver
2019-11-18 18:35 ` Andy Wingo
2019-11-18 20:57 ` Arne Babenhauserheide
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