bug#15661: 24.3.50; calendar.el broken

[Andreas Röhler]

Am 21.10.2013 09:47, schrieb Thierry Volpiatto:
> Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
>
> > Am 20.10.2013 20:13, schrieb Glenn Morris:
> > > Andreas Röhler wrote:
> > >
> > > > M-x diary-view-entries RET
> > > >
> > > > fails saying:
> > > >
> > > > Symbol's value as variable is void: displayed-month
> > >
> > > Works fine here. Recipe from emacs -Q?
> >
> > Yes, started from emacs -Q
> > Also got it from openSuse 12.3
>
> displayed-month among others is make local-var in calendar buffer,

By the mode itself, which looks wrong, as libraries outside like diary seem to 
make use of it also.

 so if
> you call the function from there (d), it will work as expected,
> otherwise the var(s) is/are unknown(s).

Get this error also from

M-x diary-view-other-diary-entries RET

while

M-x diary-show-all-entries RET

works

;;;;;;;;

Seeing inside calendar.el

(unless (boundp 'displayed-month) (setq displayed-month 1))

which doesn't look recommended.

IIUC

(defvar displayed-month 1)

should DTRT.