GNU bug report logs - #45021
[PATCH 1/2] image: Add system field.

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Message #18 received at 45021 <at> debbugs.gnu.org (full text, mbox):

From: Danny Milosavljevic <dannym <at> scratchpost.org>
To: Mathieu Othacehe <othacehe <at> gnu.org>
Cc: 45021 <at> debbugs.gnu.org
Subject: Re: [PATCH 1/2] image: Add system field.
Date: Fri, 4 Dec 2020 10:01:10 +0100

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Hi Mathieu,

On Fri, 04 Dec 2020 09:12:13 +0100
Mathieu Othacehe <othacehe <at> gnu.org> wrote:

> I used "eq?" because if "system" is left to its default in some image
> definition, then we would end-up comparing "#f" and a string.

Yeah, but eq? only compares the "addresses" of things, not the content.

(eq? "a" "a") could totally be #f if one is unlucky.

For example try:

(eq? "a" (read))

and enter "a".  The result will be #f.

On the other hand, (equal? "a" "a") would work; also (equal? "a" #f) would
not fail.

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