GNU bug report logs - #44532
27.1.50; Regression in `rx' forms in `pcase'

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1.50; Regression in `rx' forms in `pcase'
Date: Mon, 09 Nov 2020 14:44:34 +0100

It looks like `rx' forms in `pcase' forms don't work in all places with
the reimplementation of `rx'.  This is a rather annoying regression, so
I'd propose to fix it on the release branch.
With Emacs 26:

emacs -Q -batch -l cl-lib -l pcase -l rx -eval '(print (pcase "1" ((rx (? (let foo digit))) foo)))'

"1"

(as expected)

However, with Emacs 27

emacs -Q -batch -l cl-lib -l pcase -l rx -eval '(print (pcase "1" ((rx (? (let foo digit))) foo)))'
Unknown rx form ‘let’


In GNU Emacs 27.1.50 (build 9, x86_64-pc-linux-gnu, GTK+ Version 3.24.20)
 of 2020-11-09
Repository revision: f5d7fb3a2dee3f9ae49151e3d01483aad7fb734b
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux rodete

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --enable-checking=all --enable-gtk-deprecation-warnings
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Memory information:
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 (symbols 48 8614 1)
 (strings 32 23702 1904)
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Message #10 received at 44532-done <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: 44532-done <at> debbugs.gnu.org
Subject: bug#44532: 27.1.50; Regression in `rx' forms in `pcase' 
Date: Mon, 9 Nov 2020 17:30:04 +0100

Thank you very much for reporting this! Sorry about this mistake of mine; it's now been fixed.
Only the ? and ?? operators were affected, and only when written as characters rather than symbols.

Message #13 received at 44532-done <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 44532-done <at> debbugs.gnu.org
Subject: Re: bug#44532: 27.1.50; Regression in `rx' forms in `pcase'
Date: Mon, 9 Nov 2020 18:07:22 +0100

Am Mo., 9. Nov. 2020 um 17:30 Uhr schrieb Mattias Engdegård <mattiase <at> acm.org>:
>
> Thank you very much for reporting this! Sorry about this mistake of mine; it's now been fixed.
> Only the ? and ?? operators were affected, and only when written as characters rather than symbols.
>

Thanks for the quick fix!

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