ref: 72996baa32cf2e7d7e26bbc3cca1ca4340a35f7d dir: /tests/execute/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; }