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diff --git a/plugins/haskell/followsymbol.h b/plugins/haskell/followsymbol.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 "ghcmod.h"
+
+#include <texteditor/codeassist/assistproposalitem.h>
+#include <texteditor/codeassist/genericproposal.h>
+#include <texteditor/codeassist/genericproposalwidget.h>
+#include <texteditor/codeassist/iassistprocessor.h>
+#include <texteditor/codeassist/iassistprovider.h>
+
+namespace Haskell {
+namespace Internal {
+
+class FollowSymbolAssistProposalItem : public TextEditor::AssistProposalItem
+{
+public:
+    FollowSymbolAssistProposalItem(const Utils::FileName &basePath,
+                                   const Utils::optional<SymbolInfo> &info,
+                                   bool inNextSplit);
+
+    void apply(TextEditor::TextDocumentManipulatorInterface &, int) const override;
+
+private:
+    Utils::FileName m_basePath;
+    Utils::optional<SymbolInfo> m_info;
+    bool m_inNextSplit;
+};
+
+class InstantActivationProposalWidget : public TextEditor::GenericProposalWidget
+{
+protected:
+    void showProposal(const QString &prefix) override;
+};
+
+class InstantProposal : public TextEditor::GenericProposal
+{
+public:
+    InstantProposal(int cursorPos, const QList<TextEditor::AssistProposalItemInterface *> &items);
+
+    TextEditor::IAssistProposalWidget *createWidget() const override;
+};
+
+class FollowSymbolAssistProvider : public TextEditor::IAssistProvider
+{
+public:
+    RunType runType() const override;
+    TextEditor::IAssistProcessor *createProcessor() const override;
+    void setOpenInNextSplit(bool inNextSplit);
+
+private:
+    bool m_inNextSplit = false;
+};
+
+class FollowSymbolAssistProcessor : public TextEditor::IAssistProcessor
+{
+public:
+    FollowSymbolAssistProcessor(bool inNextSplit);
+
+    TextEditor::IAssistProposal *immediateProposal(const TextEditor::AssistInterface *interface) override;
+    TextEditor::IAssistProposal *perform(const TextEditor::AssistInterface *interface) override;
+
+private:
+    std::shared_ptr<AsyncGhcMod> m_ghcmod;
+    QFuture<Utils::optional<SymbolInfo>> m_symbolFuture;
+    bool m_inNextSplit;
+};
+
+} // namespace Internal
+} // namespace Haskell