actual = '';
expected = '4,';

function k(f_arg) { 
  for (var i = 0; i < 5; ++i) {
    f_arg(i);
  }
}

function t() {
  var x = 1;

  function u() {
    k(function (i) { x = i; });
    appendToActual(x);
  }

  u();
}

t();


assertEq(actual, expected)