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diff --git a/nix/boost/format/exceptions.hpp b/nix/boost/format/exceptions.hpp
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+// -*- C++ -*-
+//  Boost general library 'format'   ---------------------------
+//  See http://www.boost.org for updates, documentation, and revision history.
+
+//  (C) Samuel Krempp 2001
+//                  krempp@crans.ens-cachan.fr
+//  Permission to copy, use, modify, sell and
+//  distribute this software is granted provided this copyright notice appears
+//  in all copies. This software is provided "as is" without express or implied
+//  warranty, and with no claim as to its suitability for any purpose.
+
+// ideas taken from Rüdiger Loos's format class
+// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
+
+// ------------------------------------------------------------------------------
+// exceptions.hpp 
+// ------------------------------------------------------------------------------
+
+
+#ifndef BOOST_FORMAT_EXCEPTIONS_HPP
+#define BOOST_FORMAT_EXCEPTIONS_HPP
+
+
+#include <stdexcept>
+
+
+namespace boost {
+
+namespace io {
+
+// **** exceptions -----------------------------------------------
+
+class format_error : public std::exception
+{
+public:
+  format_error() {}
+  virtual const char *what() const throw()
+  {
+    return "boost::format_error: "
+      "format generic failure";
+  }
+};
+
+class bad_format_string : public format_error
+{
+public:
+  bad_format_string() {}
+  virtual const char *what() const throw()
+  {
+    return "boost::bad_format_string: "
+      "format-string is ill-formed";
+  }
+};
+
+class too_few_args : public format_error
+{
+public:
+  too_few_args() {}
+  virtual const char *what() const throw()
+  {
+    return "boost::too_few_args: "
+      "format-string refered to more arguments than were passed";
+  }
+};
+
+class too_many_args : public format_error
+{
+public:
+  too_many_args() {}
+  virtual const char *what() const throw()
+  {
+    return "boost::too_many_args: "
+      "format-string refered to less arguments than were passed";
+  }
+};
+
+
+class  out_of_range : public format_error
+{
+public:
+  out_of_range() {}
+  virtual const char *what() const throw()
+  {
+    return "boost::out_of_range: "
+      "tried to refer to an argument (or item) number which is out of range, "
+      "according to the format string.";
+  }
+};
+
+
+} // namespace io
+
+} // namespace boost
+
+
+#endif // BOOST_FORMAT_EXCEPTIONS_HPP