[Bug c++/63875] Bogus unused-but-set-parameter warning when expanding a variadic template argument pack

[tejohnson at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63875

--- Comment #2 from Teresa Johnson <tejohnson at google dot com> ---
Ping. This is still an issue on trunk (as of today at r220345).