new file mode 100644
--- /dev/null
+++ b/src/pt-except.h
@@ -0,0 +1,110 @@
+/*
+
+Copyright (C) 1996, 1997 John W. Eaton
+
+This file is part of Octave.
+
+Octave is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+Octave is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Octave; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#if !defined (octave_tree_except_h)
+#define octave_tree_except_h 1
+
+#if defined (__GNUG__)
+#pragma interface
+#endif
+
+class tree_statement_list;
+
+class tree_walker;
+
+#include "pt-cmd.h"
+
+// Simple exception handling.
+
+class
+tree_try_catch_command : public tree_command
+{
+public:
+
+  tree_try_catch_command (int l = -1, int c = -1)
+    : tree_command (l, c), try_code (0), catch_code (0) { }
+
+  tree_try_catch_command (tree_statement_list *tc, tree_statement_list *cc,
+			  int l = -1, int c = -1)
+    : tree_command (l, c), try_code (tc), catch_code (cc) { }
+
+  ~tree_try_catch_command (void);
+
+  void eval (void);
+
+  tree_statement_list *body (void) { return try_code; }
+
+  tree_statement_list *cleanup (void) { return catch_code; }
+
+  void accept (tree_walker& tw);
+
+private:
+
+  // The first block of code to attempt to execute.
+  tree_statement_list *try_code;
+
+  // The code to execute if an error occurs in the first block.
+  tree_statement_list *catch_code;
+};
+
+// Simple exception handling.
+
+class
+tree_unwind_protect_command : public tree_command
+{
+public:
+
+  tree_unwind_protect_command (int l = -1, int c = -1)
+    : tree_command (l, c), unwind_protect_code (0), cleanup_code (0) { }
+
+  tree_unwind_protect_command (tree_statement_list *tc,
+			       tree_statement_list *cc,
+			       int l = -1, int c = -1)
+    : tree_command (l, c), unwind_protect_code (tc), cleanup_code (cc) { }
+
+  ~tree_unwind_protect_command (void);
+
+  void eval (void);
+
+  tree_statement_list *body (void) { return unwind_protect_code; }
+
+  tree_statement_list *cleanup (void) { return cleanup_code; }
+
+  void accept (tree_walker& tw);
+
+private:
+
+  // The first body of code to attempt to execute.
+  tree_statement_list *unwind_protect_code;
+
+  // The body of code to execute no matter what happens in the first
+  // body of code.
+  tree_statement_list *cleanup_code;
+};
+
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/