void abort() { };
                                                                                                                                                          
                                                                              
extern unsigned int __VERIFIER_nondet_uint();

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

int main() {
  unsigned int x = __VERIFIER_nondet_uint();
  unsigned int y = x;

/*@
loop invariant ((y == x));
@*/
  while (x < 1024) {
    x++;
    y++;
  }

  __VERIFIER_assert(x == y);
}