https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84373
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1787r6.html > > > Confirmed. I should note that paper clearifies this to the tea now: A parameter shall not appear as a potentially-evaluated expression in a default argument. Also note that paper is considered a defect fix for at least C++20.
