// 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-recursive.c", 3, "reach_error"); }
void foo(int *p);//@ requires true; 
//@ ensures true;


void plus(int *p)//@ requires true; 
//@ ensures true;
{
    (*p)++;
    foo(p);
}

void foo(int *p) {
  if(*p<20){
      plus(p);
  }else if(*p==20){
      return;
  }else
  {
      ERRORLABEL:{reach_error();abort();}
  }
}

int main(int argc, char const *argv[])//@ requires module(simple_recursive__verifast_instrumented_modified, true); 
//@ ensures junk();

{
  int x = 0;
  int *p = &x;
  *p = 10;
  foo(p);
}