ref: 4bf1a97b6f21f2728afe47c7a9f59909b9eb84c7 dir: /tests/execute/0043-union.c/
int main() { union { int a; int b; } u; u.a = 1; u.b = 3; if (u.a != 3 || u.b != 3) return 1; return 0; }