QML Memory leak

import QtQuick 2.2
import QtQuick.Window 2.2

Window {
    id: top
    visible: true
    width: 200; height: 200
    color: "white"
    property variant item

    Timer {
        id: timer
        running: true
	repeat: true
        interval: 1
        onTriggered: {
            if(item)
                item.destroy();
	    else
		item = Qt.createQmlObject('
			    import QtQuick 2.2
			    Rectangle
			    {
				width: 100
				height: 100
				color: "blue"
				anchors.centerIn: parent

				function test()
				{
				    var t="t";
				    var b = [];
				}
			    }
			    ',
					    top);
        }
    }
}