ref: b7f42e58b25d64fa8a03e8ac06a5f5e5e92c552a 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; }