ref: 8e4b3c54d194d6daec84a696cfd9c3b8dd16d96f 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; }