ref: 3ee77ddba4ad86c4f8d0357a90d5dd855e8c619e dir: /tests/0036-notneg.c/
int main() { int x; x = 4; if(!x != 0) return 1; if(!!x != 1) return 1; if(-x != 0 - 4) return 1; return 0; }