sem_ch3.adb (Complete_Private_Subtype): If the full view is a task or protected…

sem_ch3.adb (Complete_Private_Subtype): If the full view is a task or protected type with discriminants...

2004-10-26  Ed Schonberg  <schonberg@gnat.com>

	* sem_ch3.adb (Complete_Private_Subtype): If the full view is a task
	or protected type with discriminants, do not constrain the
	corresponding record type if the subtype declaration has no
	discriminant constraints. This can be the case in source code, or in
	the subtype declaration created to rename an actual type within an
	instantiation.

From-SVN: r89670

gcc/ada/sem_ch3.adb

@@ -7059,9 +7059,15 @@ package body Sem_Ch3 is
          Set_Primitive_Operations (Full, Primitive_Operations (Full_Base));
          Set_Class_Wide_Type      (Full, Class_Wide_Type (Full_Base));
 
+      --  If this is a subtype of a protected or task type, constrain its
+      --  corresponding record, unless this is a subtype without constraints,
+      --  i.e. a simple renaming as with an actual subtype in an instance.
+
       elsif Is_Concurrent_Type (Full_Base) then
          if Has_Discriminants (Full)
            and then Present (Corresponding_Record_Type (Full_Base))
+           and then
+             not Is_Empty_Elmt_List (Discriminant_Constraint (Full))
          then
             Set_Corresponding_Record_Type (Full,
               Constrain_Corresponding_Record