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diff --git a/translate/grt/grt-stacks.adb b/translate/grt/grt-stacks.adb
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+--  GHDL Run Time (GRT) - process stacks.
+--  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 Grt.Errors; use Grt.Errors;
+
+package body Grt.Stacks is
+   procedure Error_Grow_Failed is
+   begin
+      Error ("cannot grow the stack");
+   end Error_Grow_Failed;
+
+   procedure Error_Memory_Access is
+   begin
+      Error
+        ("invalid memory access (dangling accesses or stack size too small)");
+   end Error_Memory_Access;
+
+   procedure Error_Null_Access is
+   begin
+      Error ("NULL access dereferenced");
+   end Error_Null_Access;
+end Grt.Stacks;