committed: fix bug in generic constructs

[Arnaud Charlet <charlet at aix dot act-europe dot fr>]

Tested on i686-linux
Fixes some obscure bad handling of generic constructs.
See changelog below for more details on the constructs involved.

2004-10-04  Ed Schonberg  <schonberg@gnat.com>

	* sem_ch12.adb (Check_Generic_Actuals): New predicate
	Denotes_Previous_Actual, to handle properly the case of a private
	actual that is also the component type of a subsequent array actual.
	The visibility status of the first actual is not affected when the
	second is installed.
	(Process_Nested_Formal): Subsidiary of Instantiate_Formal_Package, to
	make fully recursive the treatment of formals of packages declared
	with a box.
	(Restore_Nested_Formal): Subsidiary of Restore_Private_Views, to undo
	the above on exit from an instantiation.
	(Denotes_Formal_Package): When called from Restore_Private_Views, ignore
	current instantiation which is now complete.
	(Analyze_Package_Instantiation): No instantiated body is needed if the
	main unit is generic. Efficient, and avoid anomalies when a instance
	appears in a package accessed through rtsfind.

Attachment: difs.12
Description: Text document