2005-09-01 Javier Miranda <miranda@adacore.com>

2005-09-01  Javier Miranda  <miranda@adacore.com>
	    Ed Schonberg  <schonberg@adacore.com>

	* sem_disp.adb (Check_Controlling_Formals): Anonymous access types
	used in controlling parameters exclude null because it is necessary to
	read the tag to dispatch, and null has no tag.
	(Override_Dispatching_Operation): If the previous operation is inherited
	from an interface, it becomes hidden  and does not participate in later
	name resolution.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@103885 138bc75d-0d04-0410-961f-82ee72b054a4