Subject: Re: bug#56255: 28.1.50; sxhash-equal does not change when object is modified

From: Lars Ingebrigtsen <[email-masked]>
Date: Thu, 30 Jun 2022 11:06:34 +0200

Ihor Radchenko <[email-masked]> 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