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-- C87B28A.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 OVERLOADING RESOLUTION USES THE RULE THAT:

--

-- THE TYPE OF THE LITERAL "NULL" MUST BE DETERMINED FROM THE FACT 

-- THAT "NULL" IS A VALUE OF AN ACCESS TYPE.

-- TRH  13 AUG 82

-- JRK 2/2/84

WITH REPORT; USE REPORT;

PROCEDURE C87B28A IS

     ERR : BOOLEAN := FALSE;

     TYPE A2 IS ACCESS BOOLEAN;

     TYPE A3 IS ACCESS INTEGER;

     TYPE A1 IS ACCESS A2;

     FUNCTION F RETURN A1 IS

     BEGIN

          RETURN NEW A2;

     END F;

     FUNCTION F RETURN A2 IS

     BEGIN

          ERR := TRUE;

          RETURN NEW BOOLEAN;

     END F;

     FUNCTION F RETURN A3 IS

     BEGIN

          ERR := TRUE;

          RETURN (NEW INTEGER);

     END F;

BEGIN

     TEST ("C87B28A", "OVERLOADING OF THE ACCESS TYPE LITERAL 'NULL'");

     F.ALL := NULL;

     IF ERR THEN

          FAILED ("RESOLUTION INCORRECT FOR THE ACCESS TYPE LITERAL " &

                  "'NULL'");

     END IF;

     RESULT;

END C87B28A;