[Bug c++/58040] Cannot take address-of public using-declaration of member from protected base class

[gcc at mattwhitlock dot name via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58040

--- Comment #10 from Matt Whitlock <gcc at mattwhitlock dot name> ---
So using declarations are not a direct replacement for user-defined thunks.
Today I learned! This makes using declarations decidedly less useful than I
believed.

Thank you for your time, Jonathan Wakely.