ref: 8cd0cd7c7f5ae4003bcb9e95cd8e3f81a63d30a3 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; }