ref: b9b8ac6cf7afbdcad2b2b725b09fdeddc63ba2b3 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