2017-09-08  Eric Botcazou  <ebotcazou@adacore.com>

	* sem_util.adb (NCT_Tables_In_Use): Move to library level from...
	(New_Copy_Tree): ...there.  Reset the hash tables only if they
	were used in the previous invocation.
	* s-htable.adb: Fix typo.

2017-09-08  Bob Duff  <duff@adacore.com>

	* a-ssicst.adb (Open): Set File.Last_Op to the appropriate value.

2017-09-08  Arnaud Charlet  <charlet@adacore.com>

	* sem_aggr.adb: minor style fix.

2017-09-08  Bob Duff  <duff@adacore.com>

	* sprint.adb (Write_Corresponding_Source): Ignore if there is
	no current source file.
	(Write_Name_With_Col_Check, Write_Name_With_Col_Check_Sloc):
	Print something helpful in case N is invalid.
	* sprint.ads: Minor comment fix.

From-SVN: r251897