bug#22947: 25.0.92; xref-find-definitions fails for Perl & etags

[Bob Rogers]

   From: Eli Zaretskii <eliz@gnu.org>
   Date: Fri, 11 Mar 2016 20:34:12 +0200

   > From: Bob Rogers <rogers@modulargenetics.com>
   > Date: Fri, 11 Mar 2016 13:08:32 -0500

   > The new etags builds the table without package qualifications, but
   > after "emacs -Q" and "M-x visit-tags-table", "M-." still doesn't
   > find either the parse_recipes or add_ingredient definitions.

   Probably because you were not visiting a Perl file.  Because otherwise
   it worked for me.

Yes, I see that now.  But shouldn't it also work from other files?  I
find it very useful to type M-. on a Perl method name that appears in
documentation or in my notes, or to find a Perl definition mentioned in
a Javascript file comment (and vice versa).

   And many Perl programs have substantial C components.  Am I to
understand that M-. between C and Elisp no longer works for Emacs?

                                        -- Bob