Steps to reproduce

1. In Qt Creator, enable Preferences > C++ > File Naming > Include guard template > Use "#pragma once" instead
2. Create a new project, File > New Project... > Test Project > Qt Quick Test Project
3. Check "Generate setup code"

Outcomes
The generated setup.h contains both #pragma once and #endif // SETUP_H (which fails to compile):

#pragma once

#include <QObject>
#include <QQmlEngine>

class Setup : public QObject
{
    Q_OBJECT
public:
    Setup() = default;

public slots:
    void applicationAvailable();
    void qmlEngineAvailable(QQmlEngine *engine);
    void cleanupTestCase();
};

#endif // SETUP_H