void abort() { };
                                                                                                                                                          
                                                                                 

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

int main() {
  unsigned int x = 0;
  unsigned int y = 1;

/*@
loop invariant (((x == 6) || (x < 6)));
@*/
  while (x < 6) {
    x++;
    y *= 2;
  }

  __VERIFIER_assert(x == 6);
}