===================================================================
@@ -17484,6 +17484,15 @@ package body Sem_Ch3 is
and then Ekind (Current_Entity (Typ)) = E_Incomplete_Type
and then Full_View (Current_Entity (Typ)) = Typ
then
+ if Is_Tagged
+ and then Comes_From_Source (Current_Entity (Typ))
+ and then not Is_Tagged_Type (Current_Entity (Typ))
+ then
+ Make_Class_Wide_Type (Typ);
+ Error_Msg_N
+ ("incomplete view of tagged type should be declared tagged?",
+ Parent (Current_Entity (Typ)));
+ end if;
return;
else
If an untagged incomplete type is completed with an extension, the class_wide type must be created for the full view. If the full view has self-referential components of an anonymous access type, the class_wide type must be created before the component declarations are analyzed. Compiling the following program must yield the following warning: crash.ads:3:04: warning: imcomplete view of tagged type should be tagged package Crash is type R; type T; -- should be tagged; type R is tagged null record; type T_A is access all T; type T is new R with record Self : access T'Class; end record; function F return access T'Class; end Crash; --- package body Crash is function F return access T'Class is V : constant T_A := new T; begin if True then V.Self := F; end if; return V; end F; end Crash; Tested on x86_64-pc-linux-gnu, committed on trunk 2010-06-17 Ed Schonberg <schonberg@adacore.com> * sem_ch3.adb (Build_Incomplete_Type_Declaration): If there is an incomplete view of the type that is not tagged, and the full type is a tagged extension, create class_wide type now, and warn that the incomplete view should be tagged as well.