text: function* sequenceGenerator() {
    var i = 1;
    yield i;
    i = 3;
    yield i + 1;
    {
      var x = 3;
      yield i + x;
      yield x;
    }
  }
  
  function accumulate(iterator) {
    var result = '';
    for (var value of iterator) {
      result = result + String(value);
    }
    return result;
  }
  
  // ----------------------------------------------------------------------------
  
  expect(accumulate(sequenceGenerator())).toBe('1463');
  