ref: a799fd84aabd2df4789da1fe498e2f7ced1aa141
dir: /tests/cc/execute/0175-defined.c/
#if defined X X #endif #if defined(X) X #endif #if X X #endif #define X 0 #if X X #endif #if defined(X) int x = 0; #endif #undef X #define X 1 #if X int main() { return 0; } #endif