[Bug c++/117446] Rejects valid code on template parameter packs not expanded with '...'

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117446

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Yuchang Su from comment #0)
> It is rejected by Clang, but accepted by GCC.

Is this backwards? It's rejected by GCC, and gives a warning with clang.