https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106629
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Marek Polacek from comment #3) > Not a bug, this is > https://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#2450 I > implemented in GCC. Oh I see, I should have looked into the active defect reports too :). Even though cppreference is not part of the C++ standard. It would be useful to put a reference to that defect report on https://en.cppreference.com/w/cpp/language/template_parameters .