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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: tc2068.vhd,v 1.2 2001-10-26 16:30:15 paw Exp $
+-- $Revision: 1.2 $
+--
+-- ---------------------------------------------------------------------
+
+ENTITY c07s02b04x00p01n02i02068ent IS
+END c07s02b04x00p01n02i02068ent;
+
+ARCHITECTURE c07s02b04x00p01n02i02068arch OF c07s02b04x00p01n02i02068ent IS
+
+BEGIN
+  TESTING: PROCESS
+    -- All different type declarations.
+    -- integer types.
+    type POSITIVE        is range 0 to INTEGER'HIGH;
+    
+    -- user defined physical types.
+    type DISTANCE is range 0 to 1E9
+      units
+        -- Base units.
+        A;                    -- angstrom
+        
+        -- Metric lengths.
+        nm       = 10 A;      -- nanometer
+        um       = 1000 nm;   -- micrometer (or micron)
+        mm       = 1000 um;   -- millimeter
+        cm       = 10 mm;     -- centimeter
+--                             m        = 100 cm;    -- meter 
+        -- English lengths.
+        mil      = 254000 A;  -- mil
+        inch     = 1000 mil;  -- inch
+--                             ft       = 12 inch;   -- foot
+--                             yd       = 3 ft;      -- yard
+      end units;
+    
+    -- Local declarations.
+    variable POSV    : POSITIVE     := 0;
+    variable DISTV   : DISTANCE     := 1 A;
+  BEGIN
+    POSV := POSV + DISTV;   
+    assert FALSE 
+      report "***FAILED TEST: c07s02b04x00p01n02i02068 - The operands of the operators + and - cannot be of different types."
+      severity ERROR;
+    wait;
+  END PROCESS TESTING;
+
+END c07s02b04x00p01n02i02068arch;