ref: 8e4b3c54d194d6daec84a696cfd9c3b8dd16d96f dir: /tests/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; }