Fix and doc-fix for `buffer-local-variables'.

* src/buffer.c (Fbuffer_local_variables)
(buffer_lisp_local_variables): Handle unbound vars correctly;
don't let Qunbound leak into Lisp.

* doc/lispref/variables.texi (Creating Buffer-Local): Minor clarification
to buffer-local-variables doc.

Fixes: debbugs:10715

1 files changed, 11 insertions, 0 deletions

diff --git a/admin/notes/bugtracker b/admin/notes/bugtracker
index dd1ea46ceb2..3c24212ea10 100644
--- a/admin/notes/bugtracker
+++ b/admin/notes/bugtracker
@@ -640,3 +640,14 @@ I think you also have to add them to 'tags' and 'tags_single_letter'
 in /usr/share/perl5/Debbugs/Config.pm.
 And update /var/www/Developer.html with a description of what the tag means.
 And the "valid tags" list in /var/www/index.html.
+
+** Backups
+
+The FSF sysadmins handle multi-generational backups of the filesystem
+on debbugs.gnu.org.  But if you really want to have your own backup of
+the bug database, you can use rsync (this requires login access to
+debbugs.gnu.org):
+
+ rsync -azvv -e ssh USER@debbugs.gnu.org:/var/lib/debbugs/ DEST
+
+Note that this occupies well over 1G of disk space.