void abort() { };
                                                                                                                                                          
                                                                            

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

int main() {
  unsigned int x = 0;

/*@
loop invariant (((x % 2) == 0));
@*/
  while (x < 0x0fffffff) {
    x += 2;
  }

  __VERIFIER_assert(!(x % 2));
}