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diff --git a/src/corelib/text/qstringfwd.h b/src/corelib/text/qstringfwd.h
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+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore/qglobal.h>
+
+#ifndef QSTRINGFWD_H
+#define QSTRINGFWD_H
+
+QT_BEGIN_NAMESPACE
+
+#if QT_VERSION >= QT_VERSION_CHECK(7, 0, 0)
+# define QT_BEGIN_HAS_CHAR8_T_NAMESPACE inline namespace q_has_char8_t {
+# define QT_BEGIN_NO_CHAR8_T_NAMESPACE namespace q_no_char8_t {
+#else
+# define QT_BEGIN_HAS_CHAR8_T_NAMESPACE namespace q_has_char8_t {
+# define QT_BEGIN_NO_CHAR8_T_NAMESPACE inline namespace q_no_char8_t {
+#endif
+#define QT_END_HAS_CHAR8_T_NAMESPACE }
+#define QT_END_NO_CHAR8_T_NAMESPACE }
+
+// declare namespaces:
+QT_BEGIN_HAS_CHAR8_T_NAMESPACE
+QT_END_HAS_CHAR8_T_NAMESPACE
+QT_BEGIN_NO_CHAR8_T_NAMESPACE
+QT_END_NO_CHAR8_T_NAMESPACE
+
+class QByteArray;
+class QByteArrayView;
+class QLatin1String;
+class QStringView;
+template <bool> class QBasicUtf8StringView;
+class QAnyStringView;
+class QChar;
+class QRegularExpression;
+class QRegularExpressionMatch;
+
+#ifndef Q_CLANG_QDOC
+// ### Qt 7: remove the non-char8_t version of QUtf8StringView
+QT_BEGIN_NO_CHAR8_T_NAMESPACE
+using QUtf8StringView = QBasicUtf8StringView<false>;
+QT_END_NO_CHAR8_T_NAMESPACE
+
+QT_BEGIN_HAS_CHAR8_T_NAMESPACE
+using QUtf8StringView = QBasicUtf8StringView<true>;
+QT_END_HAS_CHAR8_T_NAMESPACE
+#endif // Q_CLANG_QDOC
+
+QT_END_NAMESPACE
+
+#endif // QSTRINGFWD_H