ref: 6853b1e9d0763d49d00264f9c1cd3edc25c3299b dir: /tests/cc/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; }