Code model should indicate an error when a state's name is not unique

Open this code in the QML editor:

import QtQuick 2.0

Rectangle {
    State{
        name: "one"
    }
    State{
        name: "two"
    }
    State{
        name: "two"
    }
}

AFAIK, this is not valid QML because two of the states have the same name. (If it is, please let me know.) The QML editor should show a warning about this error.