bug#20629: 25.0.50; Regression: TAGS broken, can't find anything in C++ files.

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 20629@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Fri, 29 May 2015 23:01:13 +0300
> 
> On 05/29/2015 09:28 PM, Eli Zaretskii wrote:
> 
> > Compatibility aside, I think what most users will want should be the
> > default.  What Exuberant ctags does now might not yet reflect the
> > changes in Emacs, from etags.el's UI to xfer.  Once they learn about
> > that, they might turn that flag on by default as well.
> 
> There's nothing particularly xref-specific in using the one or the other 
> approach. xref output buffer doesn't display the tag names, only 
> patterns (although printing the tag names as well can be added).

xref expects more accurate results, because it shows them all at once,
instead of one by one, in some order that assures the users will only
ever see the few first ones.  So yes, I'd say the switch to xref puts
a different kind of pressure on what etags/ctags does.

> > Which means C++ programmers will probably be confused by them.
> 
> They are not hard to learn. IMO, "::" is a bad separator for method 
> qualifier, since the same operator is used for namespace resolution.

foo::bar::baz is standard C++, AFAIK, so the ambiguity is already
known to C++ programmers.