void abort() { };
                                                                                                                                                          
                                                                            

/*@ 
    requires ((1 <= cond)) && (cond != 0);
    ensures ((1 <= cond)) && (1);
@*/
void __VERIFIER_assert(int cond) {
  if (!(cond)) {
    ERROR: {/*@ assert(0); */;abort();}
  }
  return;
}

int main() {
  unsigned int x = 0x0ffffff0;

  while (x > 0) {
    x -= 2;
  }

  __VERIFIER_assert(!(x % 2));
}