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diff --git a/exceptions.hpp b/exceptions.hpp
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+// Copyright 2011 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file exceptions.hpp
+/// Exception types raised by lutok.
+
+#if !defined(LUTOK_EXCEPTIONS_HPP)
+#define LUTOK_EXCEPTIONS_HPP
+
+#include <stdexcept>
+#include <string>
+
+namespace lutok {
+
+
+class state;
+
+
+/// Base exception for lua errors.
+class error : public std::runtime_error {
+public:
+    explicit error(const std::string&);
+    virtual ~error(void) throw();
+};
+
+
+/// Exception for errors raised by the Lua API library.
+class api_error : public error {
+    /// Name of the Lua C API function that caused the error.
+    std::string _api_function;
+
+public:
+    explicit api_error(const std::string&, const std::string&);
+    virtual ~api_error(void) throw();
+
+    static api_error from_stack(state&, const std::string&);
+
+    const std::string& api_function(void) const;
+};
+
+
+/// File not found error.
+class file_not_found_error : public error {
+    /// Name of the not-found file.
+    std::string _filename;
+
+public:
+    explicit file_not_found_error(const std::string&);
+    virtual ~file_not_found_error(void) throw();
+
+    const std::string& filename(void) const;
+};
+
+
+}  // namespace lutok
+
+
+#endif  // !defined(LUTOK_EXCEPTIONS_HPP)