"Access to a private member" build failure(s) — clang 9.0.1

This code is accepted by g++ but refused by clang.
gcc bug #52373 has been reported, which is a duplicate of the bug #41437.
class A
{
    struct st
    {
        static void f();
    };
};

template <typename t> void foo()
{
    A::st::f();
}
PackageVersionSupposed error messageFull log Bug report
kwave 19.08.1-1MultiTrackReader.h:61:24: error: 'QList' is a private member of 'QList' Log

1 errors