GNU bug report logs - #70597
Problem in pcase-let?

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From: Marco Antoniotti <marcoxa <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: brubar.cs <at> gmail.com, monnier <at> iro.umontreal.ca, 70597-done <at> debbugs.gnu.org
Subject: bug#70597: Problem in pcase-let?
Date: Sat, 4 May 2024 14:06:45 +0200

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Hi

sorry, but I do not think that the current doc string and/or the manual
explains the situation.

And it looks like this is a recurring misunderstanding by the users.

Just adding the example would clarify things.

All the best

MA


On Sat, May 4, 2024 at 1:35 PM Eli Zaretskii <eliz <at> gnu.org> wrote:

> > From: Marco Antoniotti <marcoxa <at> gmail.com>
> > Date: Thu, 2 May 2024 13:06:58 +0200
> > Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, brubar.cs <at> gmail.com,
> 70597 <at> debbugs.gnu.org
> >
> > it's your call.  But please change the doc string to clarify that
> pcase-let does not do "symbol equality" pattern
> > matching, but only structural matching.  Adding an example like the
> following will help.
> >
> > (pcase-let ((`(foo ,x 23 ,y) '(bar 11 baz 22))) (list x y))
>
> This is already explained in the ELisp manual, and the doc string
> already says
>
>   Each EXP should match its respective PATTERN (i.e. be of structure
>   compatible to PATTERN)
>
> So I don't think we need to do anything else here, and I'm closing
> this bug.
>


-- 
Marco Antoniotti
Somewhere over the Rainbow

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