Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>>> No, in some cases you must use (cl-declare (special ...)), and no you
>>>> can't use defvar in such cases, so if you intend to remove/deprecate
>>> Could you show us an example?
>> I used it in helm--completion-in-region to pass PROMPT and
>> REQUIRE-MATCH,
>
> Actually, no, you didn't.  🙁
> I mean, yes you did use it, but no it did not "pass PROMPT and
> REQUIRE-MATCH".

It used to work (circa 26?), but yes now it is broken, since when I
don't know, I rarely use CRM (I saw just yesterday PROMPT was no more
passing, thanks to this thread).  So because this is no more working, I
understand you don't want to bother maintaining this code which looks
complex indeed.


>> (defmacro my-with-progress (&rest body)
>>   `(let ((reporter (make-progress-reporter "Updating...")))
>>      (progn
>>        ,@body)))
>>
>> (defun my-updating ()
>>   (cl-declare (special reporter))
>>   (my-with-progress
>>    (cl-loop for elm in '(a b c d e f g)
>>             do (progn
>>                  (sit-for 1)
>>                  (progress-reporter-update reporter))
>>             collect elm)))
>
> I don't see what is the use of (cl-declare (special reporter)) here.
> What do you think it changes to the behavior of this code?

It declare reporter as a variable and prevent byte compile warnings,
same as (defvar reporter) as you have mentioned below.

>> of course you can use a defvar in this case,
>
> Exactly: (defvar reporter) would have the same effect.
>
>
>         Stefan

-- 
Thierry