bug#15661: 24.3.50; calendar.el broken

[Stefan Monnier]

> Which shouldn't be an argument by themselves to not clean up.

There's no "cleanup" needed.  It would be a major error and introduce
many bugs if we changed (defvar foo) to actually set `foo' to nil if
it's currently unbound.  And it wouldn't even patch up your problem
(since calendar wants a number rather than nil in displayed-month).

> Suggest re-openening.

IIUC your bug report was not about defvar.  You just mislead us there.
Instead, the report was about M-x diary-view-entries RET not working
from a buffer other than *Calendar*.  So, if you want to re-open this
bug (which you can do yourself), please explain why you want it to work
from other buffers, and which behavior you'd expect in that case
(e.g. which days of the diary should be displayed).


        Stefan