[Bug c++/107939] [11/12/13 Regression] Rejects use of `extern const` variable in a template since r11-557

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107939

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think p_c_e just needs to handle constexpr functors in templates.  I'll poke
more tomorrow.