https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86191
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Note clang started to accept it in clang 10.
[Bug c++/86191] Partial ordering with an expression involving non-type template parameters
pinskia at gcc dot gnu.org via Gcc-bugs Mon, 23 Aug 2021 02:20:48 -0700
