GNU bug report logs - #14565
24.3.50; Error with byte-compiled function using backward-char

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From: Stephen Berman <stephen.berman <at> gmx.net>
To: 14565 <at> debbugs.gnu.org
Subject: bug#14565: 24.3.50; Error with byte-compiled function using backward-char
Date: Thu, 06 Jun 2013 16:24:17 +0200

When I evaluate and invoke each of the following functions, they both
work as expected:

(defun my-test-1 () (forward-char nil))

(defun my-test-2 () (backward-char nil))

But if I byte-compile them, only my-test-1 works; my-test-2 raises a
Lisp error: (wrong-type-argument number-or-marker-p nil)

Here are the byte codes:

(byte-code "\300\301\302\"\207" [defalias my-test-1 #[nil "\300u\207" [nil] 1]] 3)

(byte-code "\300\301\302\"\207" [defalias my-test-2 #[nil "\300[u\207" [nil] 1]] 3)

and here is the disassembled code:

byte code for my-test-1:
  args: nil
0	constant  nil
1	forward-char 
2	return	  

byte code for my-test-2:
  args: nil
0	constant  nil
1	negate	  
2	forward-char 
3	return	  


In GNU Emacs 24.3.50.1 (x86_64-suse-linux-gnu, GTK+ Version 3.4.4)
 of 2013-06-05 on rosalinde
Bzr revision: 112853 sdl.web <at> gmail.com-20130605074002-8mmjd1r5fvnb664v
Windowing system distributor `The X.Org Foundation', version 11.0.11203000
System Description:	openSUSE 12.2 (x86_64)

Configured using:
 `configure --without-toolkit-scroll-bars CFLAGS=-g3 -O0'

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

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