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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;