bug#8034: 24.0.50; Weird elisp eval problem: float changes to integer: breaks gnus

[Michael Welsh Duggan]

Just did a bootstrap build to verify this very strange bug.  Here is a
recipe:

emacs -Q
Copy and yank the following into the *scratch* buffer:

(defvar gnus-buffer-configuration
  '((group
     (vertical 1.0
               (group 1.0 point)))
    (article
     (cond
      (gnus-use-trees
       '(vertical 1.0
                  (summary 0.25 point)
                  (tree 0.25)
                  (article 1.0)))
      (t
       '(vertical 1.0
                  (summary 0.25 point)
                  (article 1.0)))))))

Then do the following:
`C-j C-h v RET'

Note that the value of the variable as shown in the *Help* buffer has
the 1.0's in the article section changing to 1's.  This does not happen,
however, in the group section.  This bug makes it to the gnus-win.elc
file from a bootstrap compilation.  This bug causes gnus to fail when
displaying an article buffer, since 1.0 and 1 mean very different things
to gnus when doing window split computations.

In GNU Emacs 24.0.50.2 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2011-02-13 on maru
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
configured using `configure  '--without-toolkit-scroll-bars' 
'--with-imagemagick' '--verbose' 'CFLAGS=-O0 -ggdb3''

Important settings:
  value of $LC_ALL: nil
  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: nil
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  display-time-mode: t
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
C-s C-x k M-x g n u s <return> C-n <return> SPC M-u 
Q s C-x 5 f ~ / s r <tab> b a <tab> <backspace> z <tab> 
<tab> l o <tab> s r <tab> <M-backspace> l i s <tab> 
g n u <tab> <return> C-x C-f g n u s - w i <tab> c 
<return> C-s a r t i c l e <return> C-a <switch-frame> 
m C-x k M-x r e p o r t - e m a s <tab> <backspace> 
<backspace> a c s - b u g <return> <switch-frame> C-x 
b C-g C-g C-x b w <backspace> g n u s - w i n <tab> 
. <backspace> <tab> <return> C-x 4 f ~ / s e <backspace> 
r <tab> e l i <tab> f o <tab> <tab> o . e l <return> 
C-x o C-x o C-v C-g C-g C-x o <escape> > <escape> < 
C-v C-v C-n C-n C-n C-n C-p C-SPC C-M-f M-w C-x o C-y 
C-p C-p C-n C-a C-k C-k C-k <backspace> ) C-M-b C-n 
C-p C-e <M-backspace> <M-backspace> <M-backspace> f 
o o C-n C-b C-b C-b C-b C-b C-b C-SPC C-M-f C-M-f C-w 
C-d <escape> SPC <backspace> C-M-f C-SPC <escape> > 
C-w ) ) C-x C-s <M-return> <return> C-x 4 f f o o . 
e l <return> C-x C-j C-n g f C-x k C-x C-f ~ / s r 
<tab> b z <tab> e m <tab> l i s <tab> <backspace> <backspace> 
<backspace> <tab> <tab> l o <tab> l i s <tab> e <backspace> 
g n u <tab> <return> C-x 1 C-x C-f g n u s - w i n 
<tab> . e <backspace> <backspace> c <return> y e s 
<return> M-x r e p o r t - e m a <tab> <return>

Recent messages:
nnimap read 171k [26 times]
nnimap read 175k
nnimap read 176k [25 times]
nnimap read 180k
nnimap read 181k [27 times]
nnimap read 186k [39 times]
Reading active file via nndraft...done
Checking new news...done
Making completion list...
Directory has changed on disk; type g to update Dired

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/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-vm
/home/md5i/src/elisp/gnus/lisp/gnus-mlspl hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-mlspl
/home/md5i/src/elisp/gnus/lisp/nnspool hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/nnspool
/home/md5i/src/elisp/gnus/lisp/gnus-undo hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-undo
/home/md5i/src/elisp/gnus/lisp/nnnil hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/nnnil
/home/md5i/src/elisp/gnus/lisp/gnus-cite hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-cite
/home/md5i/src/elisp/gnus/lisp/mailcap hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/mailcap
/home/md5i/src/elisp/gnus/lisp/gnus-win hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-win
/home/md5i/src/elisp/gnus/lisp/gnus-async hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-async
/home/md5i/src/elisp/gnus/lisp/gnus-setup hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-setup
/home/md5i/src/elisp/gnus/lisp/gnus-agent hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-agent
/home/md5i/src/elisp/gnus/lisp/shr-color hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/shr-color
/home/md5i/src/elisp/gnus/lisp/gnus-demon hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-demon
/home/md5i/src/elisp/gnus/lisp/html2text hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/html2text
/home/md5i/src/elisp/gnus/lisp/nnmbox hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/nnmbox
/home/md5i/src/elisp/gnus/lisp/rtree hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/rtree
/home/md5i/src/elisp/gnus/lisp/nntp hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/nntp
/home/md5i/src/elisp/gnus/lisp/ietf-drums hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/ietf-drums
/home/md5i/src/elisp/gnus/lisp/nnweb hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/nnweb
/home/md5i/src/elisp/gnus/lisp/gnus-group hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-group
/home/md5i/src/elisp/gnus/lisp/sieve-mode hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/sieve-mode
/home/md5i/src/elisp/gnus/lisp/gnus-draft hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-draft
/home/md5i/src/elisp/gnus/lisp/mm-bodies hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/mm-bodies
/home/md5i/src/elisp/gnus/lisp/deuglify hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/deuglify
/home/md5i/src/elisp/gnus/lisp/gnus-start hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-start
/home/md5i/src/elisp/gnus/lisp/qp hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/qp
/home/md5i/src/elisp/gnus/lisp/nnregistry hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/nnregistry
/home/md5i/src/elisp/gnus/lisp/gnus-delay hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/gnus-delay
/home/md5i/src/elisp/gnus/lisp/legacy-gnus-agent hides 
/usr/local/share/emacs/24.0.50/lisp/gnus/legacy-gnus-agent
/home/md5i/src/elisp/gnus/lisp/parse-time hides 
/usr/local/share/emacs/24.0.50/lisp/calendar/parse-time
/home/md5i/src/elisp/gnus/lisp/time-date hides 
/usr/local/share/emacs/24.0.50/lisp/calendar/time-date
/home/md5i/src/elisp/gnus/lisp/pgg-parse hides 
/usr/local/share/emacs/24.0.50/lisp/obsolete/pgg-parse
/home/md5i/src/elisp/gnus/lisp/pgg-gpg hides 
/usr/local/share/emacs/24.0.50/lisp/obsolete/pgg-gpg
/home/md5i/src/elisp/gnus/lisp/pgg hides 
/usr/local/share/emacs/24.0.50/lisp/obsolete/pgg
/home/md5i/src/elisp/gnus/lisp/pgg-pgp hides 
/usr/local/share/emacs/24.0.50/lisp/obsolete/pgg-pgp
/home/md5i/src/elisp/gnus/lisp/pgg-def hides 
/usr/local/share/emacs/24.0.50/lisp/obsolete/pgg-def
/home/md5i/src/elisp/gnus/lisp/pgg-pgp5 hides 
/usr/local/share/emacs/24.0.50/lisp/obsolete/pgg-pgp5

Features:
(shadow emacsbug url-util url-parse url-vars vc-bzr sha1 hex-util
mule-util sort ansi-color gnus-cite gnus-async gnus-bcklg gnus-ml
disp-table gnus-topic nndraft nnmh utf-7 nnimap parse-time utf7 nnfolder
bbdb-gnus bbdb-snarf mail-extr bbdb-com nnml gnus-agent gnus-srvr
gnus-score score-mode nnvirtual gnus-msg gnus-art mm-uu mml2015
epg-config mm-view mml-smime smime dig mailcap gnus-cache edmacro kmacro
gnus-demon nntp proto-stream starttls tls nnir gnus-sum macroexp
gnus-group gnus-undo nnmail mail-source nnoo gnus-start gnus-spec
gnus-int gnus-range gnus-win gnus gnus-ems nnheader multi-isearch vc-git
vc-dispatcher vc-svn flyspell ispell server uptimes pp uniquify warnings
descr-text help-mode view tramp tramp-compat auth-source eieio byte-opt
bytecomp byte-compile assoc netrc gnus-util time-date format-spec
tramp-loaddefs time sieve-manage password-cache rng-loc rng-uri
rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns
nxml-enc xmltok nxml-util sgml-mode psvn wid-edit log-edit pcvs-util
add-log diff-mode easy-mmode inf-caml camldebug thingatpt derived shell
caml-types caml-emacs caml-font caml advice help-fns advice-preload
compile imenu message sendmail rfc822 mml easymenu mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader gnus-load
generic-x debian-el debian-el-loaddefs dired-x dired-aux dired
bbdb-autoloads bbdb timezone ange-ftp comint regexp-opt ring cl tooltip
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image fringe 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 loaddefs button minibuffer faces cus-face files
text-properties overlay 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)

-- 
Michael Welsh Duggan
(md5i@md5i.com)