https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100502
--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Extended testcase that also instantiates the friend function:
template <class T>
struct EnumeratorRange {
struct Iterator {
EnumeratorRange range_;
friend bool f(Iterator i) { return i.range_.end_reached_; }
};
private:
bool end_reached_;
};
int main() {
EnumeratorRange<int>::Iterator i;
f(i);
}
Before r11-6800, GCC rejected this testcase, however Clang accepts it. ISTM we
were correct to reject because although members of a nested class have full
access to the enclosing class, a hidden friend function defined inside the
nested class isn't really a class member, so [class.access.nest] doesn't apply.
