class TestHandler : EventHandler
{
    int a; // play variable

    struct TestStruc
    {
        void DoSomething(TestHandler h)
        {
            h.a = 1; // allowed
        }
    }

    struct TestStruc2 clearscope
    {
        void DoSomething(TestHandler h)
        {
            h.a = 1; // not allowed
        }
    }
}