From: Alan Mackenzie <acm@muc.de>
To: xah lee <xah@xahlee.org>
Cc: 1406@emacsbugs.donarmstrong.com, bug-gnu-emacs@gnu.org
Subject: bug#1406: backward-up-list reports scan error incorrectly?
Date: Sat, 22 Nov 2008 12:36:45 +0000 [thread overview]
Message-ID: <20081122123644.GA3330@muc.de> (raw)
In-Reply-To: <5F3AB054-C158-4518-9C93-6938EB2D123D@xahlee.org>
Hi, Xah!
On Fri, Nov 21, 2008 at 03:26:03PM -0800, xah lee wrote:
> Hi Alan,
> it works if you switch to text mode though.
> It doesn't work while in emacs-lisp-mode and fundamental mode.
> In any case, normally it works when inside string too. Just not in
> this particular case.
OK, I think half of the problem here is your prolixity, the other half
is my prolixity. :-)
Try instead the following example:
(defun foo (arg)
"foo does nothing."
(interactive "P"))
Put point inside "P", and do C-M-u `backward-up-list'. You get the
error. Now modify the above function by inserting an open paren into
the doc string,
(defun foo (arg)
"foo does nothing. ("
(interactive "P"))
, and do the same again. It finds that paren. Why? Because
backward-up-list assumes its starting point is NOT in a string. It
jumps backwards over (what it thinks is) the string
"\n(interactive "
, and then finds the ?\(.
This is exactly what is happening in your somewhat larger example.
In text mode, presumably the syntax table doesn't define ?\" as a string
quote. In fundamental mode, presumably it does. "(syntax-after
(point))" is your friend here.
> Xah
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2008-11-22 12:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-21 21:24 bug#1406: backward-up-list reports scan error incorrectly? xah lee
[not found] ` <handler.1406.B.122730266611840.ack@emacsbugs.donarmstrong.com>
2008-11-21 21:39 ` bug#1406: Acknowledgement (backward-up-list reports scan error incorrectly?) xah lee
2008-11-21 23:19 ` bug#1406: backward-up-list reports scan error incorrectly? Alan Mackenzie
2008-11-21 23:26 ` xah lee
2008-11-22 12:36 ` Alan Mackenzie [this message]
2008-11-22 12:53 ` xah lee
2008-11-22 13:01 ` xah lee
2008-11-22 14:04 ` Alan Mackenzie
2008-11-27 12:19 ` Alan Mackenzie
2008-11-27 15:56 ` xah lee
2008-11-27 22:09 ` Alan Mackenzie
2008-11-27 22:49 ` xah lee
[not found] ` <mailman.1345.1227787599.26697.help-gnu-emacs@gnu.org>
2008-11-27 15:52 ` Xah Lee
2011-07-09 18:04 ` Glenn Morris
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