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-- C41304A.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.

--*

-- OBJECTIVE:

--     CHECK THAT L.R RAISES CONSTRAINT_ERROR WHEN:

--       L DENOTES AN ACCESS OBJECT HAVING THE VALUE NULL.

--       L IS A FUNCTION CALL DELIVERING THE ACCESS VALUE NULL.

-- HISTORY:

--     WKB 08/14/81

--     JRK 08/17/81

--     SPS 10/26/82

--     TBN 03/26/86  PUT THE NON-EXISTENT COMPONENT CASES INTO C41304B.

--     JET 01/05/88  MODIFIED HEADER FORMAT AND ADDED CODE TO PREVENT

--                   OPTIMIZATION.

WITH REPORT; USE REPORT;

PROCEDURE C41304A IS

     TYPE R IS

          RECORD

               I : INTEGER;

          END RECORD;

     TYPE T IS ACCESS R;

BEGIN

     TEST ("C41304A", "CONSTRAINT_ERROR WHEN L IN L.R DENOTES A NULL " &

                      "ACCESS OBJECT OR A FUNCTION CALL DELIVERING " &

                      "NULL");

     --------------------------------------------------

     DECLARE

          A : T := NEW R' (I => 1);

          J : INTEGER;

     BEGIN

          IF EQUAL (4, 4) THEN

               A := NULL;

          END IF;

          J := A.I;

          FAILED ("CONSTRAINT_ERROR NOT RAISED FOR A NULL ACCESS " &

                  "OBJECT");

          IF EQUAL (J,J) THEN

               COMMENT ("NO EXCEPTION RAISED");

          END IF;

     EXCEPTION

          WHEN CONSTRAINT_ERROR =>

               NULL;

          WHEN OTHERS =>

               FAILED ("WRONG EXCEPTION RAISED FOR A NULL ACCESS " &

                       "OBJECT");

     END;

     --------------------------------------------------

     DECLARE

          J : INTEGER;

          FUNCTION F RETURN T IS

          BEGIN

               IF EQUAL (4, 4) THEN

                    RETURN NULL;

               END IF;

               RETURN NEW R' (I => 2);

          END F;

     BEGIN

          J := F.I;

          FAILED ("CONSTRAINT_ERROR NOT RAISED FOR A FUNCTION CALL " &

                  "DELIVERING A NULL ACCESS VALUE");

          IF EQUAL (J,J) THEN

               COMMENT ("NO EXCEPTION RAISED");

          END IF;

     EXCEPTION

          WHEN CONSTRAINT_ERROR =>

               NULL;

          WHEN OTHERS =>

               FAILED ("WRONG EXCEPTION RAISED FOR A FUNCTION CALL " &

                       "DELIVERING A NULL ACCESS VALUE");

     END;

     RESULT;

END C41304A;