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diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_20_ch_20_05.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_20_ch_20_05.vhd
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+
+-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs 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 of the License, or (at
+-- your option) any later version. 
+
+-- VESTs 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 VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+-- ---------------------------------------------------------------------
+--
+-- $Id: ch_20_ch_20_05.vhd,v 1.2 2001-10-26 16:29:36 paw Exp $
+-- $Revision: 1.2 $
+--
+-- ---------------------------------------------------------------------
+
+entity ch_20_05 is
+
+end entity ch_20_05;
+
+
+----------------------------------------------------------------
+
+
+architecture test of ch_20_05 is
+
+  type stimulus_list is array (natural range <>) of integer;
+
+  -- code from book:
+
+  function "&" ( a, b : stimulus_list ) return stimulus_list;
+
+  attribute debug : string;
+  attribute debug of
+    "&" [ stimulus_list, stimulus_list return stimulus_list ] : function is
+    "source_statement_step";
+
+
+    type mvl is ('X', '0', '1', 'Z');
+    type mvl_vector is array ( integer range <>) of mvl;
+    function resolve_mvl ( drivers : mvl_vector ) return mvl;
+
+    subtype resolved_mvl is resolve_mvl mvl;
+
+
+    type builtin_types is (builtin_bit, builtin_mvl, builtin_integer);
+    attribute builtin : builtin_types;
+    
+    attribute builtin of resolved_mvl : subtype is builtin_mvl;
+
+    -- end of code from book
+
+    function "&" ( a, b : stimulus_list ) return stimulus_list is
+    begin
+      return stimulus_list'(1 to 0 => 0);
+    end function "&";
+
+    function resolve_mvl ( drivers : mvl_vector ) return mvl is
+    begin
+      return drivers(drivers'left);
+    end function resolve_mvl;
+
+  begin
+  end architecture test;