function* labelledBreakGenerator() {
  var x = 1;
  var y = 2;
label:
  while (true) {
    x++;
    while (true) {
      yield x * y;
      y++;
      if (y == 3) {
        continue label;
      }
      yield x * y * 5;
      if (y == 4) {
        break label;
      }
      yield x * y * 13;
    }
    yield x * y * 11;
  }
  yield x * y * 7;
}

function accumulate(iterator) {
  var result = '';
  for (var value of iterator) {
    result += String(value);
  }
  return result;
}

// ----------------------------------------------------------------------------

assert.equal('496084', accumulate(labelledBreakGenerator()));