Trouble with std.Variant

[ddos via Digitalmars-d-learn]

struct Vec2
{
        float[2] vec;

        public float length()
        {
                return sqrt(vec[0]*vec[0]+vec[1]*vec[1]);
        }
}

int main(string[] argv)
{
        Vec2 test;
        Variant v = test;
    return 0;
}