ref: b75c7d2fa8b3f9a8ba96e5a3035efa68b8d8cf85 dir: /tests/cc/execute/0065-ifdef.c/
#ifdef FOO XXX #ifdef BAR XXX #endif XXX #endif #define FOO 1 #ifdef FOO #ifdef FOO int x = 0; #endif int main() { return x; } #endif