What magic is saying "obsolete variable"

What magic is saying "obsolete variable"

[Lennart Borgman]

I am trying to understand how to get rid of the "obsolete variable"
warnings (and taking care of them, of course), but there is some magic
going on that I do not understand

When stepping through this in edebug

      (mumamo-save-buffer-state nil
        (remove-list-of-text-properties (point-min) (point-max)
                                        (list 'fontified)))

I get the warning below after passing the next last `)':

  Warning: `font-lock-beginning-of-syntax-function' is an obsolete variable (as
    of Emacs 23.3); use `syntax-begin-function' instead.

The macro `mumamo-save-buffer-state' is just a copy of
save-buffer-state in font-lock.el (which is not exposed by
font-lock.el).

Can anyone please explain why I get the warning here and maybe what I
can do about it?

Re: What magic is saying "obsolete variable"

[Stefan Monnier]

> When stepping through this in edebug

>       (mumamo-save-buffer-state nil
>         (remove-list-of-text-properties (point-min) (point-max)
>                                         (list 'fontified)))

> I get the warning below after passing the next last `)':

>   Warning: `font-lock-beginning-of-syntax-function' is an obsolete variable (as
>     of Emacs 23.3); use `syntax-begin-function' instead.

This warning comes from the byte-compiler.  I have no idea why the
byte-compiler is called during your edebug.

> The macro `mumamo-save-buffer-state' is just a copy of
> save-buffer-state in font-lock.el (which is not exposed by
> font-lock.el).

Newer Emacsen have the macro with-silent-modifications for that, so you
may want to use that one (or a copy of it) instead.


        Stefan

Re: What magic is saying "obsolete variable"

[Lennart Borgman]

On Sat, Dec 18, 2010 at 4:50 PM, Stefan Monnier
<monnier@iro.umontreal.ca> wrote:
>> When stepping through this in edebug
>
>>       (mumamo-save-buffer-state nil
>>         (remove-list-of-text-properties (point-min) (point-max)
>>                                         (list 'fontified)))
>
>> I get the warning below after passing the next last `)':
>
>>   Warning: `font-lock-beginning-of-syntax-function' is an obsolete variable (as
>>     of Emacs 23.3); use `syntax-begin-function' instead.
>
> This warning comes from the byte-compiler.  I have no idea why the
> byte-compiler is called during your edebug.
>
>> The macro `mumamo-save-buffer-state' is just a copy of
>> save-buffer-state in font-lock.el (which is not exposed by
>> font-lock.el).
>
> Newer Emacsen have the macro with-silent-modifications for that, so you
> may want to use that one (or a copy of it) instead.


Thanks, I have forgotten to switch to a copy of that.

However this is very similar to the save-buffer-state so I guess it is
not involved here. The differences involved are just

  (declare (debug t) (indent 0)) =new=> (declare (indent 1) (debug let))

and an unwind-protect in the new macro.