GNU bug report logs - #79673
[PATCH] (setf (plist-get x) y) returns wrong value when setting new keys

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Package: emacs;

Reported by: Jacob Komissar <dev <at> jacob.komissar.net>

Date: Wed, 22 Oct 2025 07:15:03 UTC

Severity: normal

Tags: patch

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#79673; Package emacs. (Wed, 22 Oct 2025 07:15:03 GMT) Full text and rfc822 format available.
Acknowledgement sent to Jacob Komissar <dev <at> jacob.komissar.net>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Wed, 22 Oct 2025 07:15:04 GMT) Full text and rfc822 format available.

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

From: Jacob Komissar <dev <at> jacob.komissar.net>
To: bug-gnu-emacs <at> gnu.org
Subject: [PATCH] (setf (plist-get x) y) returns wrong value when setting new
 keys
Date: Tue, 21 Oct 2025 21:51:27 -0400

[Message part 1 (text/plain, inline)]
I noticed that this code returns the full plist instead of just the
newly-set value, contrary to the documentation for setf.

    (let ((plist '(:a 1)))
      (setf (plist-get :b) 2))

I've attached a patch that fixes the plist-get gv expander to return the
correct value.

---Jacob Komissar
[0001-Make-plist-get-s-gv-setter-return-the-new-value.patch (text/x-patch, attachment)]
This bug report was last modified 14 days ago.

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