2006-10-31  Ed Schonberg  <schonberg@adacore.com>
	    Hristian Kirtchev  <kirtchev@adacore.com>
	    Javier Miranda  <miranda@adacore.com>

	* sem_type.adb (Add_One_Interp): If node is an indirect call, preserve
	subprogram type to provide better diagnostics in case of ambiguity.
	(Covers): Handle coverage of formal and actual anonymous access types in
	the context of generic instantiation.
	(Covers/Interface_Present_In_Ancestors): Use the base type to manage
	abstract interface types; this is required to handle concurrent types
	with discriminants and abstract interface types.
	(Covers): Include type coverage of both regular incomplete subtypes and
	incomplete subtypes of incomplete type visibles through a limited with
	clause.

From-SVN: r118311