RE: Buffer-menu-toggle-files-only should use Buffer-menu-revert, not revert-buffer

[Drew Adams]

       buff-menu.el seems to be preloaded. There is no `provide buff-menu'.
Yet,
       there are user options like Buffer-menu-sort-column. How can a user
set such
       a variable with a defvar in his .emacs?

    The user should use setq (or setq-default) in his .emacs and not
    defvar.  Using `defvar' is a convention for Lisp libraries.

I won't debate that, even if I disagree. If you like, substitute "Lisp
library" for "user and his .emacs" - the same problem is there, I think:
There is no way to use a defvar to define these variables.