Steps to reproduce:

1) Attempt to compile the following short program:
//-------------------------------------------------------
struct GLITCH
{
    private int i;
}

void main()
{
    GLITCH bad_access = GLITCH();
    bad_access.i = 4;
}
//-------------------------------------------------------
...and observe the results.

Notice that the above is accepted by the compiler without complaint, even though a non-member method is directly modifying a private member.