[Bug c++/63151] [5/6/7 regression] Accessibility error when brace-constructing base class with protected defaulted constructor and member variable

[db0451 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63151

--- Comment #3 from DB <db0451 at gmail dot com> ---
see also 66847, 66617, 55922