what's the mystery of file-name variable?

what's the mystery of file-name variable?

[filebat Mark]

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Hi emacsers

Below is quite strange to me.

(setq file-name "test")
(describe-variable 'file-name)
,----------- output
| "file-name's value is nil
|
| Documentation:
| Not documented as a variable."
`-----------

Why file-name is not changed?

-- 
Thanks & Regards

Denny Zhang

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RE: what's the mystery of file-name variable?

[Drew Adams]

> (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.

Re: what's the mystery of file-name variable?

[filebat Mark]

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Hi Adams

Thanks a lot for your quick response.

After clean start with emacs -Q, the problem remain.

Below is my emacs-version:
Emacs 23.3.2 (i686-pc-linux-gnu, GTK+ Version 2.20.1) of 2011-04-06 on
wei-laptop


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.
>
>


-- 
Thanks & Regards

Denny Zhang

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RE: what's the mystery of file-name variable?

[Drew Adams]

> After clean start with emacs -Q, the problem remain.	
> Below is my emacs-version:
> Emacs 23.3.2...

(Please use plain text for this mailing list, not HTML.)

I can reproduce the bug in Emacs 23.1, 23.2, and 23.3.  It is a regression - it
works in Emacs versions prior to Emacs 23.  It has been fixed again in Emacs 24
(which is not yet released), apparently.

You can downgrade to Emacs 22 or try using the Emacs 24 pretest.  Or you can
find the fix they made or the Emacs 22 code for it and try using that in your
Emacs 23 session.

Re: what's the mystery of file-name variable?

[S Boucher]

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You do not say how you eval'ed the TWO expressions.

If you are in the scratch buffer and place the cursor at the end of the 2nd line, and hit C-j, emacs is only going to eval that line, which is the last sexp before the cursor.

Try putting your cursor at the end of this, and hit C-j:

(progn

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


Or eval each line one after the other.


>________________________________
>From: filebat Mark <filebat.mark@gmail.com>
>To: Drew Adams <drew.adams@oracle.com>
>Cc: help-gnu-emacs@gnu.org
>Sent: Thursday, October 27, 2011 12:47:44 PM
>Subject: Re: what's the mystery of file-name variable?
>
>
>Hi Adams
>
>Thanks a lot for your quick response.
>
>After clean start with emacs -Q, the problem remain.
>
>Below is my emacs-version:
>Emacs 23.3.2 (i686-pc-linux-gnu, GTK+ Version 2.20.1) of 2011-04-06 on wei-laptop
>
>
>
>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.
>>
>>
>
>
>-- 
>Thanks & Regards
>
>Denny Zhang
>
>
>
>

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