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[Ada] improve null-excluding error msg

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Javier Miranda <miranda at adacore dot com>
Date: Wed, 29 Aug 2007 10:35:32 +0200
Subject: [Ada] improve null-excluding error msg

Tested on i686-linux, committed on trunk

This patch improves the error messages generated by the frontend with
wrong use of null-excluding anonymous access types. For example:
--
  procedure k (m : not null in integer);
--
Command: gcc -c -gnat05 k.ads
Output:  k.ads:1:18: "not null" can only be used with "access"
         k.ads:1:18: "in" not allowed together with "access"

2007-08-14  Javier Miranda  <miranda@adacore.com>

	* par-ch6.adb (P_Formal_Part): Fix wrong error message associated with
	null-excluding access types.

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