ref: 63c625229ddae2be9785f8c9a0e4e5c5d2a6cb6c 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; }