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[Ada] fix CE in s-regpat.adb

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Emmanuel Briot <briot at adacore dot com>
Date: Wed, 12 Sep 2007 14:09:23 +0200
Subject: [Ada] fix CE in s-regpat.adb

When the runtime is compiled with checks on (no -gnatp), a constraint error is
raised by the following code:

with GNAT.Regpat; use GNAT.Regpat;
procedure Empty is
   Re : Pattern_Matcher := Compile ("a[]b");
begin
   null;
end Empty;

See gnat.dg/regpat1.adb

2007-09-10  Emmanuel Briot  <briot@adacore.com>

	* s-regpat.adb (Parse_Character_Class): Fix handling of empty character
	classes ("[]").

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