// verifast_options{disable_overflow_check target:ILP32}


extern void __assert_fail (const char *__assertion, const char *__file,
      unsigned int __line, const char *__function)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
extern void __assert_perror_fail (int __errnum, const char *__file,
      unsigned int __line, const char *__function)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
extern void __assert (const char *__assertion, const char *__file, int __line)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));

extern void abort(void);//@ requires true; 
//@ ensures true;

void reach_error() //@ requires false; 
//@ ensures true;
{ ((void) sizeof ((0) ? 1 : 0), __extension__ ({ if (0) ; else __assert_fail ("0", "mine-tutorial-ex4.8.c", 3, __extension__ __PRETTY_FUNCTION__); })); }
void __VERIFIER_assert(int cond) //@ requires (cond != 0); 
//@ ensures (cond != 0);
{ if(!(cond)) { ERROR: {reach_error();abort();} } }
extern _Bool __VERIFIER_nondet_bool();//@ requires true; 
//@ ensures true;

int main() //@ requires module(mine2017_ex4_8__verifast_instrumented_modified, true); 
//@ ensures junk();
{
  int v = 0;
  while (__VERIFIER_nondet_bool() == 0)//@ invariant ((v <= 1) && (0 <= v));
 {
    __VERIFIER_assert(0 <= v);
    __VERIFIER_assert(v <= 1);
    if (v == 0)
      v = 1;
  }
  return 0;
}