https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102199
--- Comment #6 from Eyal Rozenberg <eyalroz1 at gmx dot com> --- (In reply to Jonathan Wakely from comment #4) > See PR 96645 and PR 101227 Ok. But does that explain why defining an explicit constructor cause g++ to accept the class as default-constructible?