[Bug c++/82613] Cannot access private definitions in base clause of friend class template

[fabian.loeschner at live dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82613

--- Comment #1 from fabian.loeschner at live dot de ---
By the way: it compiles fine with Clang trunk and in Visual Studio 2017 (MSVC
19.11)