[Bug c++/66847] Derived class calling protected base ctor using C++11 {brace} init = spurious access denied error

[db0451 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66847

--- Comment #9 from DB <db0451 at gmail dot com> ---
Will the fix hit any previous major versions, esp. 6?