[fpc-pascal] Typecast class-of to class

[Marco van de Voort]

In our previous episode, Mattias Gaertner said:
> 
> FPC allows to type cast a class-of variable to a class instance. Is
> this a bug or a feature?
> 
> var
>   c: TClass;
> begin
>   TObject(c).ClassName; // crash
> end.

Feature (allowed because equal in size), used in e.g. Registerxxx functions to add class references to the
.objects part of tstringlist. Delphi has no container type for references