ref: b44a95b8fbe1a524074dfcb96ee5efb89c9a1c9a 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; }