StackOverflow in JS when using nested Scala XML literals

[kazachonak]

class MyEntryPoint extends EntryPoint {
  def onModuleLoad {
    val xml = <b><i>text</i>text</b>
    RootPanel.get().add(new Label(xml.toString))
  }
}

DevMode works. But when compiled to JS
IE says "Stack overflow at line..."
Chrome says "Uncaught RangeError: Maximum call stack size exceeded"
Looks like the problem is inside xml.toString

But this works fine everywhere:

class MyEntryPoint extends EntryPoint {
  def onModuleLoad {
    val xml = <b>text</b>
    RootPanel.get().add(new Label(xml.toString))
  }
}