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From: Glenn Morris <rgm@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Warnings about keymaps
Date: Mon, 14 Sep 2009 15:10:25 -0400
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Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
To: Stefan Monnier <monnier@iro.umontreal.ca>
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Stefan Monnier wrote:

> The bug can be seen more directly by byte-compiling the file below:
>
>    (defconst foo nil)
>    (defvar foo nil)
>
> Looks like the "assignment-to-constant" warning should be more
> careful to distinguish defvar from setq.

This seems a fairly nonsensical thing to do, so why shouldn't the
compiler warn about it? The defvar is a best a no-op, at worst a bug
(if you were expecting it to have an effect).