RFA: GDB manual: document tracepoint packets

[Jim Blandy]

On 11/20/05, Eli Zaretskii <eliz@gnu.org> wrote:
> Should we perhaps say "(empty)" to prevent readers from thinking it's
> a typo?

You'll still get the single quotes around the thing, since it's a
@table @samp.  I think '' is pretty widely recognized.

If you've looked at the way both @item and @item @r{(empty)} look in
print and info, and you prefer the latter, I'd be happy to make the
change.