bug#27178: 26.0.50; libxml-parse-*-region functions ignore discard-comments argument

[Noam Postavsky]

Eli Zaretskii <eliz@gnu.org> writes:

>> Hm...  do we have a mechanism to mark parameters as obsolete
>
> I don't believe so, but maybe others will have me corrected.

I think we have advertised-calling-convention for this:

    `(advertised-calling-convention SIGNATURE WHEN)'
          This acts like a call to `set-advertised-calling-convention'
          (*note Obsolete Functions::); SIGNATURE specifies the correct
          argument list for calling the function or macro, and WHEN
          should be a string indicating when the old argument list was
          first made obsolete.