debug-on-error doesn't catch 'cannot write backup file'

[Dan Jacobson]

I did  (set-variable (quote debug-on-error) t)
but that was not enough to start the dubugger when one hit
"Cannot write backup file; backing up in %backup%~"
True, I use backup-dir.el, but those words aren't from there.
And maybe it should give the whole path for where it is putting the
backup, I can't seem to find it.  Odd too that as root I couldn't
backup to where I please.  I had used EDITOR=emacs exim -Meb ...
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