QT 5.10 Expected token `numeric literal' bug

[MikhailG]

Hello I`m expierencing this strange bug in qt 5.10 but if I change the qt version to 5.8.0 everything works just fine. The error appears in this line if (lastKeyBoard !== let)

import QtQuick 2.9
import QtQuick.Window 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    property var lastKeyBoard: letRu
    function setKeyBoard(txt) {

        if(txt === "text")
        {
            if (lastKeyBoard !== let) // ERROR Expected token `numeric literal'
                lastKeyBoard = letRu
            lastKeyBoard.visible = true
        }
    }
}

What could it be?

[A Former User]

Hi! What's letRu? let is a reserved keyword in Javascript.

[MikhailG]

Yes it was the problem. Thank you. So the bug was in QT 5.8.0 apparently.

[aurora_ns]

Sir, I am a newbie. Can you please help me to? I haven't even started and got that error.
https://forum.qt.io/topic/151582/qt-qml-execution-problem-after-installation?_=1698365642694