ref: 3b91cba7aee04f37a8ba3270bd1cbd28f4198c24 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; }