[Bug c++/48292] New: [C++0x] "sorry, unimplemented: use of 'type_pack_expansion' in template"

["zeratul976 at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48292

           Summary: [C++0x] "sorry, unimplemented: use of
                    'type_pack_expansion' in template"
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zeratul976@hotmail.com


For the following code:

template <typename... Args> int g(Args...);

template <int N = 0>
struct A
{
    template <typename... Args>
    static auto f(Args... args) -> decltype(g(args...));
};

int main()
{
    A<>::f();
    return 0;
}

gcc gives the following errors:

test.cpp: In function 'int main()':
test.cpp:7:27: sorry, unimplemented: use of 'type_pack_expansion' in template
test.cpp:12:12: error: no matching function for call to 'A<>::f()'
test.cpp:12:12: note: candidate is:
test.cpp:7:55: note: template<class ... Args> static decltype (g(A::f::args
...)) A::f(Args ...) [with Args = {Args ...}, int N = 0, decltype (g(A::f::args
...)) = int]

Are there any plans to implement this?