using System;

GetItem<MyStruct>(new MyStruct[1], 0);

static T GetItem<T>(T[] a, int i)
{
    try
    {
        return a[i];
    }
    catch (IndexOutOfRangeException)
    {
        ThrowHelper();
        return default;
    }
}

static void ThrowHelper() => throw new Exception();

struct MyStruct
{
    byte b;
}