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Re: Should undefined behavior be encouraged in Emacs?

From: Dave Abrahams
Subject: Re: Should undefined behavior be encouraged in Emacs?
Date: Mon, 03 Oct 2011 11:15:23 -0400
User-agent: Gnus/5.110018 (No Gnus v0.18) Emacs/23.3 (darwin)

on Mon Oct 03 2011, Richard Stallman <rms-AT-gnu.org> wrote:

>     My impression is that Emacs built-ins are generally supposed to
>     have defined behavior, so that Emacs is easier to use reliably.
> What is the meaning of "defined" or "undefined", here?
> Is it a matter of whether the documentation says what happens in that case?
> In simple cases such as (goto-char -5), users tend to see what the
> behavior is, and are likely to write code that depends on it, even if
> it isn't documented.  Thus, leaving it undocumented doesn't mean that
> we can change it and nobody will notice.

If you make it a hard, inescapable error, that won't happen.

Dave Abrahams
BoostPro Computing

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