Displaying \x3 to QTextEdit leads to warning and later to crash

#include <QApplication>
#include <QDialog>
#include <QTextEdit>
#include <QVBoxLayout>

static QTextEdit* edit = NULL;

void MessageOutput( QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
    QString message = "[DEBUG] -- " + msg + "\n";
    edit->append(message.toStdString().c_str());
}

int main( int argc, char* argv[] )
{
    QApplication app(argc, argv);

    qInstallMessageHandler(MessageOutput);

    QDialog dlg;
    dlg.setLayout( new QVBoxLayout );
    edit = new QTextEdit;
    edit->append( "(\"/0@\x3\\r\\n\")\n" );
    dlg.layout()->addWidget( edit );
    dlg.show();

    return app.exec();
}