https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98939
--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #6) > Note I think this paper applies to C++20 too or at least part of it. > > From CWG1291: > [Accepted at the November, 2020 meeting as part of paper P1787R6 and moved > to DR at the February, 2021 meeting.] Yes, but I think we need to be conservative about changes that break existing code. My expectation in comment #0 that the amount of code broken would be small seems to have been over-optimistic.