Re: using finalizers

[Eli Zaretskii]

> Date: Fri, 31 Dec 2021 10:46:20 +0800
> From: LdBeth <andpuke@foxmail.com>
> Cc: emacs-devel@gnu.org
> 
> > What is the expected example usage of finalizers in Emacs Lisp?
> > How can I verify, that my finalizer works?
> 
> (setq bar nil)
> (setq foo (make-finalizer (lambda ()
>                             (setq bar t))))
> 
> (setq foo nil)
> (garbage-collect)
> 
> bar ; => t

I think that the assumption that a call to garbage-collect will
necessarily call the finalizer is also problematic: there's usually no
simple way to make sure there are no references left to the object,
and GC could have its own ideas when to actually garbage-collect an
object.