bug#20852: 24.3; update-file-autoloads doesn't accept unescaped parenthesis character literal

[Philipp Stephani]

Create an Elisp file such as

   (defvar foo ?()

and try to run `update-file-autoloads' on it.  This will fail with an
unbalanced parenthesis error.  However, this is valid (albeit
discouraged) Elisp code.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)
 of 2014-03-07 on lamiak, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:     Ubuntu 14.04 LTS

Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-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/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

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

Major mode: Emacs-Lisp

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x C-f / t m p / a u t o l o a d t e s t . e l <return> 
( d e f v a r SPC f o o SPC ? ( ) <return> C-x C-s 
M-x b y t e - c o m <tab> <return> a u t o <tab> <return> 
M-x u p d a t e - a u <tab> <tab> f <tab> <return> 
a u <tab> <return> a u <backspace> <backspace> l o 
a <tab> d d e f s . e l <return> M-x r e p o r t <
return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
(New file)
Saving file /tmp/autoloadtest.el...
Wrote /tmp/autoloadtest.el
Compiling /tmp/autoloadtest.el...done
Wrote /tmp/autoloadtest.elc
Making completion list...
Generating autoloads for /tmp/autoloadtest.el...
forward-sexp: Scan error: "Unbalanced parentheses", 1, 17

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message byte-opt format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils autoload help-fns help-mode easymenu
warnings compile comint ansi-color ring bytecomp byte-compile cconv
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer loaddefs button faces cus-face macroexp files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

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