// verifast_options{disable_overflow_check target:ILP32}


extern void abort(void);
//@ requires true;
//@ ensures true;
void reach_error()
//@ requires false;
//@ ensures true;
{}void __VERIFIER_assert(int cond) 
//@ requires (cond != 0);
//@ ensures (cond != 0);
{ if(!(cond)) { ERROR: {reach_error();abort();} } }int main() 
//@ requires module(mine2017_ex4_6__verifast_instrumented, true);
//@ ensures junk();
{
    //@ open_module(); 
  int x = 40;
while (x != 0)
//@ invariant ((0 <= x) && (x <= 40));
    {
    __VERIFIER_assert(x <= 40);
    x--;
    __VERIFIER_assert(x >= 0);
  }
  __VERIFIER_assert(x == 0);
  return 0;
}