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diff --git a/testsuite/vests/vhdl-93/billowitch/compliant/tc3157.vhd b/testsuite/vests/vhdl-93/billowitch/compliant/tc3157.vhd
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+
+-- Copyright (C) 2001 Bill Billowitch.
+
+-- Some of the work to develop this test suite was done with Air Force
+-- support.  The Air Force and Bill Billowitch assume no
+-- responsibilities for this software.
+
+-- 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: tc3157.vhd,v 1.2 2001-10-26 16:29:52 paw Exp $
+-- $Revision: 1.2 $
+--
+-- ---------------------------------------------------------------------
+
+ENTITY c05s03b00x00p16n01i03157ent IS
+  -- Define resolution function for SIG:
+  function RESFUNC( S : BIT_VECTOR ) return BIT is
+  begin
+    for I in S'RANGE loop
+      if (S(I) = '1') then
+        return '1';
+      end if;
+    end loop;
+    return '0';
+  end RESFUNC;
+
+  -- Define the signal.
+  subtype RBIT is RESFUNC BIT;
+  signal SIG : RBIT bus;
+
+  -- Use the implicit disconnect specification here.
+
+  -- Define the GUARD signal.
+  signal GUARD : BOOLEAN := FALSE;
+begin
+END c05s03b00x00p16n01i03157ent;
+
+ARCHITECTURE c05s03b00x00p16n01i03157arch OF c05s03b00x00p16n01i03157ent IS
+
+BEGIN
+
+  -- Define the guarded signal assignment.
+  L1: block
+  begin
+    SIG <= guarded '1';
+  end block L1;
+
+
+  TESTING: PROCESS
+    variable ShouldBeTime : TIME;
+  BEGIN
+    -- 1. Turn on the GUARD, verify that SIG gets toggled.
+    GUARD <= TRUE;
+    ShouldBeTime := NOW;
+    wait on SIG;
+    assert( SIG = '1' ) severity FAILURE;
+    assert( ShouldBeTime = NOW ) severity FAILURE;
+    
+    -- 2. Turn off the GUARD, verify that SIG gets turned OFF.
+    GUARD <= FALSE;
+    ShouldBeTime := NOW;
+    wait on SIG;
+    assert( SIG = '0' ) severity FAILURE;
+    assert( ShouldBeTime = NOW ) severity FAILURE;
+
+    assert NOT( SIG = '0' and ShouldBeTime = NOW )
+      report "***PASSED TEST: c05s03b00x00p16n01i03157"
+      severity NOTE;
+    assert ( SIG = '0' and ShouldBeTime = NOW )
+      report "***FAILED TEST: c05s03b00x00p16n01i03157 - Default disconnect specification test failed."
+      severity ERROR;
+    
+    -- Define a second driver for SIG, just for kicks.
+    -- Should never get invoked.  Not have an effect on the value.
+    SIG <= '0' after 10 ns;
+    wait;
+  END PROCESS TESTING;
+
+END c05s03b00x00p16n01i03157arch;