2010-09-09  Ed Schonberg  <schonberg@adacore.com>

	* sem.adb (Walk_Library_Items): Traverse context of subunits of the
	main unit.
	(Is_Subunit_Of_Main): Handle null nodes properly.

2010-09-09  Robert Dewar  <dewar@adacore.com>

	* par-ch2.adb: Update comments.

From-SVN: r164083