ref: 4dba5596398fe88df1210f15d0a1ccb68604c2da
dir: /tests/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