procedure {:inline 2} foo()
  modifies x;
{
  x := x + 1;
  call foo();
}

procedure {:inline 2} foo1()
  modifies x;
{
  x := x + 1;
  call foo2();
}

procedure {:inline 2} foo2()
  modifies x;
{
  x := x + 1;
  call foo3();
}

procedure {:inline 2} foo3()
  modifies x;
{
  x := x + 1;
  call foo1();
}

var x:int;

procedure  bar()
  modifies x;
{
  call foo();
  call foo1();
}