[Bug c++/65906] using-declaration allowed for non-direct base class

[danregister at poczta dot fm]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65906

--- Comment #1 from Daniel Adamski <danregister at poczta dot fm> ---
Just to clarify, it is "Base()" that's being called, not "Base(int, int)" (I
should have used something else than "__func__").