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bug#6375: 23.1; elisp manual example condition-case re-signal of error
From: |
Kevin Ryde |
Subject: |
bug#6375: 23.1; elisp manual example condition-case re-signal of error |
Date: |
Tue, 08 Jun 2010 11:47:03 +1000 |
User-agent: |
Gnus/5.110011 (No Gnus v0.11) Emacs/23.2 (gnu/linux) |
I had to scratch my head a bit a while ago to find out how a
condition-case handler should re-signal an error. It'd be good if the
elisp manual had an example of that. Just one line, as that section is
a bit wordy already.
There were two spots in emacs itself wrongly doing an apply instead of a
call for such a re-signal, so I suppose I'm not the only one to be
confused. (The one in cedet/semantic/wisent.el might still be there.)
2010-06-08 Kevin Ryde <user42@zip.com.au>
* control.texi (Handling Errors): Show example of condition-case
handler re-signalling an error.
--- control.texi.~1.7.~ 2009-02-24 08:41:24.000000000 +1100
+++ control.texi 2009-11-02 15:26:38.000000000 +1100
@@ -1019,7 +1019,11 @@
. @var{data})}. The handler can refer to this list to decide what to
do. For example, if the error is for failure opening a file, the file
name is the second element of @var{data}---the third element of the
-error description.
+error description. The handler can re-signal the error with
+
+@example
+(signal (car var) (cdr var)) ;; re-signal
+@end example
If @var{var} is @code{nil}, that means no variable is bound. Then the
error symbol and associated data are not available to the handler.
In GNU Emacs 23.1.1 (i486-pc-linux-gnu, GTK+ Version 2.16.5)
of 2009-09-14 on raven, modified by Debian
configured using `configure '--build=i486-linux-gnu' '--host=i486-linux-gnu'
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
'--localstatedir=/var/lib' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim'
'--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars'
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g
-O2' 'LDFLAGS=-g' 'CPPFLAGS=''
- bug#6375: 23.1; elisp manual example condition-case re-signal of error,
Kevin Ryde <=