ref: ce2658123d520c647f2c1a3d1a40b3f3d47f73bc 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; }