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[Ada] Fix index check error in g-dyntab.adb

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Matthew Heaney <heaney at adacore dot com>
Date: Wed, 15 Feb 2006 11:17:27 +0100
Subject: [Ada] Fix index check error in g-dyntab.adb

Tested on i686-linux, committed on trunk

The conversion from Natural to Table_Index_Type was implemented by first
converting Idx (of type Natural) to Table_Index_Type, and then adding that
offset to the lower bound of the array.  But that implementation wasn't quite
correct, since there's no guarantee that Table_Index_Type includes values in
the range of subtype Natural.  (This can happen if Table_Index_Type has only
negative values in its range, for example.)

2006-02-13  Matthew Heaney  <heaney@adacore.com>

	*  g-dyntab.adb (Index_Of): conversion from Natural can no longer raise
	Constraint_Error.

Attachment: difs.54
Description: Text document

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