struct struct1_t {
    int a;
    int b;
};

struct struct2_t {
    int a;
    int b;
};

void pass_struct1(struct1_t sref)
{
}

void pass_struct2(structref<struct1_t> sref)
{
}

void test_struct()
{
    struct1_t st1;
    struct2_t st2;

    st1 = st1;
    st1 = st2;
    st1.a = st2.b;

    pass_struct1(st1);
    pass_struct2(st1);
    pass_struct2(st2);
}