[Bug c++/52126] [4.7 Regression] compilation error

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52126

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-07 17:23:40 UTC ---
(In reply to comment #2)
> Further investigation shows that the issue appears only when inheritance from
> the template class (class B : private A<T>) is provided explicitly. According
> to the standard a nested class defined inside a class template is implicitly
> template as well.

I don't think that's relevant.  The point is that the injected-class-name 'A'
and 'A<T>' both refer to the class template, and should work equivalently.

It can be reduced to:

template<typename T>
struct A
{
    int foo;

    struct B : A<T>
    {
        using A::foo;
    };
};