std::forward and variadic templates failed in Nov 2012 CTP by imoldman

the code snippet fail in Nov 2012 CTP

#include <memory>
#include <string>

template<typename T, typename ...Args>
std::unique_ptr<T> make_unique( Args&& ...args ) {
    return std::unique_ptr<T>( new T( std::forward<Args>(args)... ) );
}

int main() {
    auto p = make_unique<std::string>(std::string("foobar"));
    return 0;
}

================================
output:
error C2065: 'basic_string<char,std::char_traits<char>,std::allocator<char> >' : undeclared identifier
error C2974: 'std::forward' : invalid template argument for '_Ty', type expected