wat

// UPD: This code doesn't compile in VS 2015 Update 2. Update 3 fixed it!

#include <type_traits>
#include <unordered_map>

template <typename... Args>
using wut = std::index_sequence_for<Args...>;

int main()
{
    std::unordered_map<int, int> x;
    x[2] = 6;
}