GNU bug report logs - #27545
25.1; Unused lexical variable when byte-compiling pcase with guards

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Message #12 received at 27545 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Yuri Khan <yuri.v.khan <at> gmail.com>
Cc: 27545 <at> debbugs.gnu.org, 25558 <at> debbugs.gnu.org
Subject: Re: bug#25558: Spurious warnings with variables mentioned only
 pcase guard patterns
Date: Fri, 03 Sep 2021 10:49:09 +0200

Yuri Khan <yuri.v.khan <at> gmail.com> writes:

> C-x C-f test.el RET
>
> ;; -*- lexical-binding: t -*-
>
> (defun foo (x)
>   (pcase x
>     ((and `(,bar ,baz)
>           (guard (eq bar 'quux)))
>      baz)))
>
> C-x C-s
> M-x byte-compile RET test.el RET
>
> Observed output:
>
> Compiling file /home/yuri/test.el at Sat Jul  1 16:27:36 2017
> test.el:3:1:Warning: Unused lexical variable ‘bar’

I can reproduce this in Emacs 26.1, but not in Emacs 28, so I'm guessing
that this is fixed, and I'm closing this bug report.  If there's still
problems here, please respond to the debbugs address and we'll reopen.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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