GNU bug report logs - #7145
elisp-code behaves differently after byte-compilation

Previous Next

Full log

View this message in rfc822 format

From: Markus Sauermann <mhoram <at> gmx.de>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: 7145 <at> debbugs.gnu.org, Andreas Schwab <schwab <at> linux-m68k.org>
Subject: bug#7145: elisp-code behaves differently after byte-compilation
Date: Tue, 05 Oct 2010 19:37:03 +0200

Hi,

Am 03.10.2010 07:12, schrieb Chong Yidong:
> 
> I think we're just going to have to ask people not to do that...
> 

it looks like an undocumented feature ;-)
Here is a suggestion for a patch for the documentation (trunk of emacs
Bazaar repository)

--- BEGIN ---
=== modified file 'doc/lispref/objects.texi'
--- doc/lispref/objects.texi	2010-08-19 23:23:13 +0000
+++ doc/lispref/objects.texi	2010-10-05 18:00:58 +0000
@@ -1999,6 +1999,17 @@
      @result{} nil
 @end group
 @end example
+
+Be aware that byte-compiling a comparison of strings with @code{eq}
+might give unexpected results.
+
+@example
+@group
+(funcall (byte-compile (lambda () (let ((foo "bar"))
+                                    (eq foo "bar")))))
+     @result{} t
+@end group
+@end example
 @end defun

 @defun equal object1 object2

--- END ---

Regards
Markus

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.