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diff --git a/disp_tree.ads b/disp_tree.ads
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+--  Node displaying (for debugging).
+--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
+--
+--  GHDL 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.
+--
+--  GHDL 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 GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with Iirs; use Iirs;
+
+package Disp_Tree is
+   --  Disp NODE as an address.  The format is "[XXXXXXXX]", where each X is
+   --  an hexadecimal digit (quotes are not displayed).
+   procedure Disp_Iir_Address (Node: Iir);
+
+   --  Disp TREE recursively.
+   procedure Disp_Tree (Tree: Iir;
+                        Tab: Natural := 0;
+                        Flat_Decl: Boolean := false);
+
+end Disp_Tree;