ref: 97bfd21a430fbac3267e12e5d67a92a7f5ced8a9 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; }