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Subject: [Bug c++/48292] [C++0x] "sorry, unimplemented: use of 'type_pack_expansion' in template"
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48292

--- Comment #2 from Nathan Ridge <zeratul976 at hotmail dot com> 2011-03-26 00:02:32 UTC ---
Found a workaround:

#include <type_traits>

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

template <typename... Args>
struct deduce
{
    typedef decltype(g(std::declval<Args>()...)) type;
};

template <int N = 0>
struct A
{
    template <typename... Args>
    static typename deduce<Args...>::type f(Args... args);
};

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