[Bug c++/94983] Empty list initialization of aggregate class with deleted default ctor rejected in C++14 and C++17

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94983

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1008r1.pdf was the
C++20 change, and the appendix shows the messy history.