int x = 0
[1, 2, 3].each (new Closure(this, this) {
  void call() {
    x++
  }
})

print x
-----
0(1) element: null
1(2) WRITE x
2(3) READ x
3(4) element: Anonymous class
4(5) READ print
5(6) READ x
6(7) ARGUMENT element: Reference expression
7(8) element: Call expression MAYBE_RETURN
8() element: null