GNU bug report logs - #58513
describe-function should say that defconst variables are constant

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Message #38 received at 58513 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: Phil Sainty <psainty <at> orcon.net.nz>, Lars Ingebrigtsen <larsi <at> gnus.org>,
 58513 <at> debbugs.gnu.org
Subject: Re: bug#58513: describe-function should say that defconst variables
 are constant
Date: Sat, 15 Oct 2022 10:11:35 -0400

Stefan Kangas [2022-10-15 12:33:29] wrote:
> Stefan Monnier <monnier <at> iro.umontreal.ca> writes:
>> The byte-compiler already does warn about it, but only if the assignment
>> is in the same file as the `defconst`.
> I don't get any warnings with this recipe:
>
>     echo "(defconst foo-bar t) (setq foo-bar nil)" > /tmp/foo.el
>     emacs -Q -batch -eval '(byte-compile-file "/tmp/foo.el")'
>
> Am I missing something?

Hmm... I don't get a warning either.  And looking at `bytecomp.el` I see
that we push stuff to `byte-compile-const-variables` but we never look
stuff up in it :-(

I'm pretty sure I wrote some code to use that variable (apparently
around 2003), but apparently it got lost in subsequent changes, probably
when we introduced lexical-binding.


        Stefan

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