[Bug c++/126797] explicit instantiation of function variadic template with const qualified explicit template type argument rejected

[waffl3x at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126797

--- Comment #2 from Alex <waffl3x at gcc dot gnu.org> ---
(In reply to Drea Pinski from comment #1)
> I thought I saw this bug before ...

PR64063 I did find this one while searching, I thought about mentioning
it, guess I should have. Very similar, and there are cases that don't
involve members, but none that produce the same diagnostic so I suspect
it is manifesting somewhere else.