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Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better
From: |
Michael Heerdegen |
Subject: |
Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better |
Date: |
Mon, 20 Apr 2020 02:16:03 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Štěpán Němec <address@hidden> writes:
> Regarding comparing two equal floats, strings or lists by `eq', you warn
> about its undefinedness ("might not return nil") repeatedly, but can you
> give an actual example where (eq 1.2 1.2) or (eq "string" "string")
> returns non-nil in Elisp?
(eq "" "") => t. You don't even have to compile.
> Otherwise, isn't it too hypothetical/theoretical to talk about in the
> manual?
It is important. This once bit me, and it took a long time until I
found out what was wrong. I had to ask here (AFAIR that's the reason
why an explanation was added to the manual). And it was not code to
provoke that kind of thing.
Michael.
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Štěpán Němec, 2020/04/18
- RE: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Drew Adams, 2020/04/18
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Paul Eggert, 2020/04/19
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Štěpán Němec, 2020/04/19
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Paul Eggert, 2020/04/19
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Michael Heerdegen, 2020/04/19
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Štěpán Němec, 2020/04/20
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Michael Heerdegen, 2020/04/20
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Paul Eggert, 2020/04/22
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better,
Michael Heerdegen <=
- Re: emacs-27 eebfb72 1/2: Document constant vs mutable objects better, Richard Stallman, 2020/04/20