GNU bug report logs - #79902
31.0.50; cl-destructuring-bind misuses ignored parameter

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Package: emacs;

Reported by: Sean Whitton <spwhitton <at> spwhitton.name>

Date: Thu, 27 Nov 2025 18:24:01 UTC

Severity: normal

Found in version 31.0.50

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#79902; Package emacs. (Thu, 27 Nov 2025 18:24:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Sean Whitton <spwhitton <at> spwhitton.name>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Thu, 27 Nov 2025 18:24:02 GMT) Full text and rfc822 format available.

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

From: Sean Whitton <spwhitton <at> spwhitton.name>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; cl-destructuring-bind misuses ignored parameter
Date: Thu, 27 Nov 2025 18:23:10 +0000

--8<---------------cut here---------------start------------->8---
(defun vc--fileset-by-state (fileset)
  "..."
  (cl-destructuring-bind (backend remaining &rest _ &aux ret-val)
      fileset
    ;; code using BACKEND and REMAINING but not _
    ret-val))
--8<---------------cut here---------------end--------------->8---

generates

--8<---------------cut here---------------start------------->8---
In toplevel form:
vc/vc.el:5274:51: Warning: variable ‘_’ not left unused
--8<---------------cut here---------------end--------------->8---

This is because the generated expansion does (pop _) to obtain BACKEND
and REMAINING.  It should use a gensym, not the user's `_'.

-- 
Sean Whitton
This bug report was last modified 4 days ago.

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