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bug#14565: 24.3.50; Error with byte-compiled function using backward-cha
From: |
Stephen Berman |
Subject: |
bug#14565: 24.3.50; Error with byte-compiled function using backward-char |
Date: |
Sat, 08 Jun 2013 15:20:20 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) |
On Fri, 07 Jun 2013 11:40:23 +0200 Stephen Berman <stephen.berman@gmx.net>
wrote:
> On Thu, 06 Jun 2013 22:28:22 -0400 Glenn Morris <rgm@gnu.org> wrote:
>
>> I suppose there could still be cases like
>>
>> (setq foo nil)
>> (backward-char foo)
>
> Yes, in fact, after seeing your fix, I realized that I had
> oversimplified my test case; the code which revealed the bug actually
> looks more like this (still simplified, but enough to raise the error
> with your fix):
>
> (defun my-test-3 ()
> (let (x)
> (backward-char (when x 2))))
>
>> I wonder if these bytecomp handlers are worth keeping?
>
> I don't see how to tweak byte-compile-backward-char to account for the
> above cases, but I don't understand the bytecomp code well. However, I
> did test adding a case Bbackward_char to exec_byte_code parallel to
> Bforward_char, and that handles the above cases as expected. So that
> may be the easiest fix.
Should this bug be reopened, or would you prefer me to submit a new
report for the unresolved cases?
Steve Berman