// verifast_options{disable_overflow_check target:ILP32}

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

extern void __assert_fail(const char *, const char *, unsigned int, const char *) __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
void reach_error() //@ requires false; 
//@ ensures true;
{ __assert_fail("0", "simple_4-2.c", 3, "reach_error"); }

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

int main(void) //@ requires module(simple_4_2__verifast_instrumented_modified, true); 
//@ ensures junk();
{
  unsigned int x = 0x0ffffff0;

  while (x > 0)//@ invariant true;
 {
    x -= 2;
  }

  __VERIFIER_assert(!(x % 2));
}