[Bug gdb/28946] New: Missing template paramater pack support

["jengelh at inai dot de" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28946

            Bug ID: 28946
           Summary: Missing template paramater pack support
           Product: gdb
           Version: 11.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: jengelh at inai dot de
  Target Milestone: ---

Input
=====
```
template<typename... T> void f(T&&...zzargs) {}
int main() { f(0); }
```

g++-11 -Wall -ggdb3 x.cpp

Observed output
===============
» gdb a.out
GNU gdb (GDB; openSUSE Tumbleweed) 11.1
...
(gdb) b main
(gdb) r
...
Breakpoint 1, main () at x.cpp:2
2       int main() { f(0); }
Missing separate debuginfos, use: zypper install
libgcc_s1-debuginfo-11.2.1+git1173-2.3.x86_64
libstdc++6-debuginfo-11.2.1+git1173-2.3.x86_64
(gdb) s
f<int> () at x.cpp:1
1       template<typename... T> void f(T&&...zzargs) {}
(gdb) info args
No arguments.
(gdb) p zzargs
No symbol "zzargs" in current context.


Expected output
===============

(gdb) info args
zzargs = {0}
(gdb) p zzargs
$1 = {0}

or something of the sort.

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