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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- A D A . E X C E P T I O N S . I S _ N U L L _ O C C U R R E N C E --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2000-2009, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+---------------------------------------
+-- Ada.Exceptions.Is_Null_Occurrence --
+---------------------------------------
+
+function Ada.Exceptions.Is_Null_Occurrence
+ (X : Exception_Occurrence) return Boolean
+is
+begin
+ -- The null exception is uniquely identified by the fact that the Id value
+ -- is null. No other exception occurrence can have a null Id.
+
+ if X.Id = Null_Id then
+ return True;
+ else
+ return False;
+ end if;
+end Ada.Exceptions.Is_Null_Occurrence;