default struct value in method Error

[ifshuaishuai]

public struct TestStruct
{
    public int id;

    public override string ToString()
    {
        return id.ToString();
    }
}

public static void TestMethodDefaultStructValue()
{
    PrintValue(100);
}

public static void PrintValue(int a, TestStruct b = default(TestStruct))
{
    Console.WriteLine("a = " + a + ", b = " + b.ToString());
}

[liiir1985]

Issue fixed