This code causes it to hang indefinitely it seems. I've waited a while and it still hasn't terminated execution. Some similar code

    struct Vector2
    {
        float x;
        float y;

        alias byRef this;

        ref const(Vector2) byRef() const
        {
            return this;
        }

        Vector2 opBinary(string op : "+")(ref const(Vector2) a) const
        {
            return Vector2(x + a.x, y + a.y);
        }

    }


    void main()
    {
        Vector2 a = Vector2(1, 2);
        Vector2 b = Vector2(3, 4);

        Vector2 c = a + b; // this line causes application to run infinitely

        Vector2 d = a + Vector2(5, 6); // this line seg faults without the above line

    }