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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/increment.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/increment.vhd
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+
+-- Copyright (C) 2002 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 
+
+entity increment is
+end entity increment;
+
+
+
+architecture test of increment is
+
+  subtype word32 is bit_vector(31 downto 0);
+
+  -- code from book
+
+  procedure increment ( a : inout word32;  by : in word32 := X"0000_0001" ) is
+    variable sum : word32;
+    variable carry : bit := '0';
+  begin
+    for index in a'reverse_range loop
+      sum(index) := a(index) xor by(index) xor carry;
+      carry := ( a(index) and by(index) ) or ( carry and ( a(index) xor by(index) ) );
+    end loop;
+    a := sum;
+  end procedure increment;
+
+  -- end code from book
+
+begin
+
+  stimulus : process is
+
+    variable count : word32 := X"0001_1100";
+
+  begin
+
+    -- code from book (in text)
+
+    increment(count, X"0000_0004");
+
+    increment(count);
+
+    increment(count, by => open);
+
+    -- end code from book
+
+    wait;
+  end process stimulus;
+
+end architecture test;