content: _iteratorNormalCompletion = true
  _didIteratorError = false
  _iteratorError = undefined
  If err = Eval("For _iterator = z.Symbol.iterator()
  _step = /*null*/ To /*undefined*/ Step undefined
    _step$value = _step.value
    x = _step$value.x
    y = _step$value.y
  End For") Then 
    _didIteratorError = true
    _iteratorError = err
  End If