In our previous episode, Daniel Gaspary said:
> gtree.TTree type has the following code:
>
> How is possible then that the following program don't raise an error
> when the destructor (via free) is called?
Free only calls the destructor if self isn't nil.
procedure TObject.Free;
begin
// the call via self avoids a warning
if self<>nil then
self.destroy;
end;
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