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diff --git a/plugins/haskell/haskelleditorwidget.h b/plugins/haskell/haskelleditorwidget.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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 General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** 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-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "followsymbol.h"
+
+#include <texteditor/texteditor.h>
+#include <utils/optional.h>
+
+namespace Haskell {
+namespace Internal {
+
+class Token;
+
+class HaskellEditorWidget : public TextEditor::TextEditorWidget
+{
+public:
+    HaskellEditorWidget(QWidget *parent = 0);
+
+    static Utils::optional<Token> symbolAt(QTextDocument *doc, int position,
+                                           int *line, int *column);
+
+protected:
+    Link findLinkAt(const QTextCursor &cursor, bool resolveTarget = true,
+                    bool inNextSplit = false) override;
+
+private:
+    FollowSymbolAssistProvider m_followSymbolAssistProvider;
+};
+
+} // namespace Internal
+} // namespace Haskell