1-- C87B28A.ADA
2
3--                             Grant of Unlimited Rights
4--
5--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
6--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
7--     unlimited rights in the software and documentation contained herein.
8--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
9--     this public release, the Government intends to confer upon all
10--     recipients unlimited rights  equal to those held by the Government.
11--     These rights include rights to use, duplicate, release or disclose the
12--     released technical data and computer software in whole or in part, in
13--     any manner and for any purpose whatsoever, and to have or permit others
14--     to do so.
15--
16--                                    DISCLAIMER
17--
18--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
19--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
20--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
21--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
22--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
23--     PARTICULAR PURPOSE OF SAID MATERIAL.
24--*
25-- CHECK THAT OVERLOADING RESOLUTION USES THE RULE THAT:
26--
27-- THE TYPE OF THE LITERAL "NULL" MUST BE DETERMINED FROM THE FACT
28-- THAT "NULL" IS A VALUE OF AN ACCESS TYPE.
29
30-- TRH  13 AUG 82
31-- JRK 2/2/84
32
33WITH REPORT; USE REPORT;
34
35PROCEDURE C87B28A IS
36
37     ERR : BOOLEAN := FALSE;
38
39     TYPE A2 IS ACCESS BOOLEAN;
40     TYPE A3 IS ACCESS INTEGER;
41     TYPE A1 IS ACCESS A2;
42
43     FUNCTION F RETURN A1 IS
44     BEGIN
45          RETURN NEW A2;
46     END F;
47
48     FUNCTION F RETURN A2 IS
49     BEGIN
50          ERR := TRUE;
51          RETURN NEW BOOLEAN;
52     END F;
53
54     FUNCTION F RETURN A3 IS
55     BEGIN
56          ERR := TRUE;
57          RETURN (NEW INTEGER);
58     END F;
59
60BEGIN
61     TEST ("C87B28A", "OVERLOADING OF THE ACCESS TYPE LITERAL 'NULL'");
62
63     F.ALL := NULL;
64
65     IF ERR THEN
66          FAILED ("RESOLUTION INCORRECT FOR THE ACCESS TYPE LITERAL " &
67                  "'NULL'");
68     END IF;
69
70     RESULT;
71END C87B28A;
72