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+--  C55B04A.ADA
+
+--                             Grant of Unlimited Rights
+--
+--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
+--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 
+--     unlimited rights in the software and documentation contained herein.
+--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
+--     this public release, the Government intends to confer upon all 
+--     recipients unlimited rights  equal to those held by the Government.  
+--     These rights include rights to use, duplicate, release or disclose the 
+--     released technical data and computer software in whole or in part, in 
+--     any manner and for any purpose whatsoever, and to have or permit others 
+--     to do so.
+--
+--                                    DISCLAIMER
+--
+--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
+--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 
+--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
+--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 
+--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
+--     PARTICULAR PURPOSE OF SAID MATERIAL.
+--*
+-- CHECK THAT A LOOP IS NOT ENTERED IF THE LOWER BOUND OF THE DISCRETE
+--   RANGE IS GREATER THAN THE UPPER BOUND, WHETHER REVERSE IS PRESENT
+--   OR NOT.
+
+-- CHECK THAT LOOP BOUNDS ARE EVALUATED ONLY ONCE, UPON ENTRY TO 
+--   THE LOOP.
+
+-- DAS  01/12/81
+-- SPS 3/2/83
+-- JBG 8/21/83
+
+WITH REPORT;
+PROCEDURE C55B04A IS
+
+     USE REPORT;
+
+     C10 : CONSTANT INTEGER := 10;
+     I10 : INTEGER;
+
+BEGIN
+     TEST ( "C55B04A", "CHECK OPERATION OF A FOR LOOP OVER A NULL " & 
+                       "DISCRETE RANGE" );
+
+     -- NOTE: EXIT STATEMENTS ARE INCLUDED TO AID IN RECOVERY FROM
+     --   TEST FAILURE.
+
+     -- SUBTESTS INVOLVING STATIC BOUNDS:
+
+     FOR I IN 10..1 LOOP
+          FAILED ( "LOOPING OVER NULL RANGE 10..1" );
+          EXIT;
+     END LOOP;
+
+     FOR I IN REVERSE INTEGER RANGE -1..-10 LOOP
+          FAILED ( "LOOPING OVER NULL RANGE -1..-10" );
+          EXIT;
+     END LOOP;
+
+     FOR I IN (C10 + 3)..(-3 * C10 + 27) LOOP     -- 13..-3
+          FAILED ("LOOPING OVER NULL RANGE (C10 + 3)..(-3 * C10 + 27)");
+          EXIT;
+     END LOOP;
+
+
+     -- SUBTESTS INVOLVING DYNAMIC BOUNDS:
+
+     I10 := IDENT_INT(10);
+
+     FOR I IN REVERSE I10..(I10-1) LOOP           -- 10..9
+          FAILED ( "LOOPING OVER NULL RANGE I10..(I10-1)");
+          EXIT;
+     END LOOP;
+
+
+     FOR I IN (C10 - I10)..(I10 - 11) LOOP        -- 0..-1
+          FAILED ( "LOOPING OVER NULL RANGE (C10 - I10)..(I10 - 11)" );
+          EXIT;
+     END LOOP;
+
+
+     -- SUBTEST OF BOUNDS EVALUTION ONLY AT ENTRY:
+
+     FOR I IN 1..I10 LOOP
+          I10 := I10 - 1;
+     END LOOP;
+     IF (I10 /= 0) THEN
+          FAILED ( "LOOP BOUNDS NOT FIXED AT LOOP ENTRY" );
+     END IF;
+
+     RESULT;
+
+END C55B04A;