https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116162
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Or do you mean instead of error it should be just defined as deleted perhaps with warning per https://eel.is/c++draft/dcl.fct.def#default-2.6 ? In that case, I think clang implements it correctly and while GCC claims to implement https://wg21.link/p0641r2 it probably doesn't implement that fully or correctly.
