2011-08-05  Matthew Heaney  <heaney@adacore.com>

	* a-comutr.adb, a-cimutr.adb, a-cbmutr.adb (Read): do not use T'Valid
	to check count, check sign of value instead.
	* a-comutr.adb, a-cimutr.adb (Write): return immediately if tree empty
	(Copy_Subtree): allocate copy of source element
	(Equal_Subtree): compare elements, not access objects

2011-08-05  Vincent Celier  <celier@adacore.com>

	* gnat_ugn.texi: Fix VMS alternative.

From-SVN: r177457