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diff --git a/Source/CTest/cmCTestHG.h b/Source/CTest/cmCTestHG.h
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+++ b/Source/CTest/cmCTestHG.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc.
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmCTestHG_h
+#define cmCTestHG_h
+
+#include "cmCTestGlobalVC.h"
+
+/** \class cmCTestHG
+ * \brief Interaction with Mercurial command-line tool
+ *
+ */
+class cmCTestHG: public cmCTestGlobalVC
+{
+public:
+  /** Construct with a CTest instance and update log stream.  */
+  cmCTestHG(cmCTest* ctest, std::ostream& log);
+
+  virtual ~cmCTestHG();
+
+private:
+  std::string GetWorkingRevision();
+  virtual void NoteOldRevision();
+  virtual void NoteNewRevision();
+  virtual bool UpdateImpl();
+
+  void LoadRevisions();
+  void LoadModifications();
+
+  // Parsing helper classes.
+  class IdentifyParser;
+  class StatusParser;
+  class LogParser;
+  friend class IdentifyParser;
+  friend class StatusParser;
+  friend class LogParser;
+};
+
+#endif