Binding with Qt.locale()

[pi-null-mezon]

Should binding with Qt.locale() works?

Example (2 states):

Binding works with this declaration:

import QtQuick 2.4
import QtQuick.Controls 2.1
import QtQuick.Window 2.1

Window {
    id: window
    visible: true
    width: 320
    height: 240

    signal translationAsked(string language)

    Column {
        anchors.centerIn: parent
        spacing: 20
        Label {
            text: Qt.locale().name + " " +  Qt.locale().dateFormat(Locale.ShortFormat)

        }
        ComboBox {
            model: ["English","Русский"]
            onCurrentIndexChanged: translationAsked(model[currentIndex])
        }                
        Label {
            text: new Date().toLocaleDateString(Qt.locale(),Locale.ShortFormat)
        }
        Label {
             text: any_not_defined_name // throws 'qrc:/main.qml:28: ReferenceError: fgh is not defined'
        }
    }
}

But stops to work if I comment last label (that causes ReferenceError). Does anybody know why? And how bind with Qt.locale() in right way?