ref: be4a2c8631c6401c37a7caf59d5bd476d2a5a125 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; }