using System;

public class C<T>
{
    public enum E { }
}

class B
{
    static void Main()
    {
        var x = typeof(B).GetMethod("Foo").GetParameters()[0].DefaultValue;
        Console.WriteLine(x);
        Console.WriteLine(x.GetType());
        Console.WriteLine(x.GetType().ContainsGenericParameters);
    }

    public static void Foo<T>(C<T>.E x = new C<T>.E()) {}
}