GNU bug report logs - #56255
28.1.50; sxhash-equal does not change when object is modified

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Package: emacs;

Reported by: Ihor Radchenko <yantar92 <at> gmail.com>

Date: Mon, 27 Jun 2022 12:27:02 UTC

Severity: normal

Found in version 28.1.50

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Ihor Radchenko <yantar92 <at> gmail.com>
Cc: 56255 <at> debbugs.gnu.org
Subject: bug#56255: 28.1.50; sxhash-equal does not change when object is modified
Date: Thu, 30 Jun 2022 11:06:34 +0200

Ihor Radchenko <yantar92 <at> gmail.com> writes:

> As for the hash tables and collisions. Are you sure that collisions are
> OK? Consider the following example:
>
> (setq a (avl-tree--create #'org-element--cache-compare))
> (avl-tree-enter a '(headline (:begin 2)))
> (setq tbl (make-hash-table :test #'equal))
> (puthash a 'value tbl)
> (gethash a tbl)
> (plist-put (nth 1 (avl-tree-first a)) :begin 10)
> (gethash a tbl) ;; the value does not change!

That has nothing to do with collisions -- you're free to alter a key as
much as you want.  It's just a normal Lisp object.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
This bug report was last modified 3 years and 58 days ago.

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