On Fri, Oct 28, 2011 at 12:44 AM, Drew Adams <drew.adams@oracle.com> wrote:

> (setq file-name "test")
> (describe-variable 'file-name)

> file-name's value is nil
>
> Documentation:
> Not documented as a variable."

It works for me. Says file-name's value is "test" (and not documented etc.).

Give a recipe starting from emacs -Q.