GNU bug report logs - #72754
31.0.50; Add a pcase-pattern-let?

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Message #8 received at 72754 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 72754 <at> debbugs.gnu.org
Subject: Re: bug#72754: 31.0.50; Add a pcase-pattern-let?
Date: Thu, 22 Aug 2024 09:38:04 -0400

> wouldn't it be a significant improvement and maybe a low hanging fruit
> to add a macro allowing to add local pattern definitions?  I.e., like
> `macrolet' by for pcase patterns?

I don't know how important/useful it would be, but yes it would make
a lot of sense.  As a matter of fact, it's a general pattern which
recurs in all the packages which provide an extensible domain specific
language (peg.el, pcase.el, bindat.el, rx.el, gv.el, ...) and I'd like
to find a general solution.

It can also make sense to allow defining a set of extensions at one
place, and then make them available locally.


        Stefan

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