According to 13.2 [temp.param] paragraph 3, the following fragment is ill-formed:

    template <class T>
    class X{
      friend void T::foo();
    };

In the friend declaration, the T:: part is a nested-name-specifier (9.3 [dcl.decl] paragraph 4), and T must be a class-name or a namespace-name (_N4567_.5.1.1 [expr.prim.general] paragraph 7). However, according to 13.2 [temp.param] paragraph 3, it is only a type-name. The fragment should be well-formed, and instantiations of the template allowed as long as the actual template argument is a class which provides a function member foo. As a result of this defect, any usage of template parameters in nested names is ill-formed, e.g., in the example of 13.8 [temp.res] paragraph 2.