"bar" does not have members

#ifndef BAR_H
#define BAR_H

#include <QObject>

class Bar : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString baz READ baz WRITE setBaz NOTIFY bazChanged)

public:
    Bar() {}

    QString baz() const { return mBaz; }

    void setBaz(const QString &baz)
    {
        if (baz == mBaz)
            return;

        mBaz = baz;
        emit bazChanged();
    }

signals:
    void bazChanged();

private:
    QString mBaz;
};


#endif // BAR_H

#ifndef FOO_H
#define FOO_H
#include <QObject>
#include "bar.h"


class Foo : public QObject
{
    Q_OBJECT
    Q_PROPERTY(Bar *bar READ bar CONSTANT FINAL)

public:
    Foo() {}

    Bar *bar() { return &mBar; }

private:
    Bar mBar;
};
#endif // FOO_H

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>

#include "foo.h"
#include "bar.h"

int main(int argc, char *argv[])
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif

    QGuiApplication app(argc, argv);


    QQmlApplicationEngine engine;

    qmlRegisterType<Foo>("App", 1, 0, "Foo");
    qmlRegisterAnonymousType<Bar>("App", 1);

    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);

    return app.exec();
}

import QtQuick 2.12
import QtQuick.Window 2.12
import App 1.0

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

    Foo {
        bar.baz: "abc"
        Component.onCompleted: print(bar.baz)
    }

}