Dynamic and extension method

gistfile1.txt

public static class Program
{
    public static void Main(string[] args)
    {
        dynamic a = 1;
        MethodWithDynamic(a).Extension();
    }

    public static int MethodWithDynamic(dynamic a)
    {
        return 1;
    }

    public static void Extension(this int i)
    {
    }
}