bug#7587: 23.2; `format-mode-line' makes Emacs crash

[Michael Heerdegen]

Hello,

if I evaluate the following sexp in a fresh emacs -Q (e.g. with
`eval-expression'):

(progn
  (face-remap-add-relative 'mode-line :height 1.0)
  (format-mode-line mode-line-format t))

Emacs instantly crashes.



In GNU Emacs 23.2.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2010-08-14 on raven, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
configured using `configure  '--build' 'i486-linux-gnu' '--build' 
'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/23.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.2/leim'
 '--with-x=yes' '--with-x-toolkit=lucid' '--with-toolkit-scroll-bars' 
'--without-gconf' 'build_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 
'LDFLAGS=-g' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: de_DE.utf8
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: C
  value of $LANG: de_DE.utf8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t