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bug#15661: 24.3.50; calendar.el broken

From: Andreas Röhler
Subject: bug#15661: 24.3.50; calendar.el broken
Date: Sun, 20 Oct 2013 18:50:28 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.0

M-x diary-view-entries RET

fails saying:

Symbol's value as variable is void: displayed-month

AFAIU reason is new defvar behavior, which breaks legacy code.

calendar.el has a

(defvar displayed-month)

which doesn't longer intialise to nil.

There must be a lot of things be broken that way.

Please consider reverting that change to defvar.
Maybe signaling lexical scope with a buffer-local variable might do the job and 
make me happy again? ;)



In GNU Emacs (i686-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2013-08-28 on purzel.sitgens
Windowing system distributor `The X.Org Foundation', version 11.0.11203000
System Description:     openSUSE 12.2 (i586)

Configured using:
 `configure 'CFLAGS=-g -O''

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

Major mode: Emacs-Lisp

Minor modes in effect:
  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
  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:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<menu-bar> <options> <menu-set-font> <help-echo> <help-echo>
C-x C-f <M-backspace> <M-backspace> 2 0 1 3 1 0 2 0
<tab> l i a s <tab> <backspace> <backspace> s o <backspace>
p <tab> c a l e <tab> c a l e <tab> <return> M-x e
v a l - b u <tab> <return> <help-echo> <help-echo>
<help-echo> <help-echo> M-x h s <backspace> <backspace>
s h e l l <return> c d <return> > SPC d i a r y <return>
l a <backspace> s SPC - l a r t <return> C-x b <return>
M-x d i r a <backspace> <backspace> a r y - v i e w
<tab> e n t r <tab> <return> M-x r e p o r t - e m
a c s . <backspace> - b u <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
%: Symbol's value as variable is void: displayed-month

Load-path shadows:
None found.

(shadow sort gnus-util mail-extr emacsbug message 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 diary-lib diary-loaddefs shell pcomplete comint
ansi-color ring derived cal-menu easymenu calendar cal-loaddefs vc-git
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 prog-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 nadvice 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
gfilenotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)

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