[fpc-pascal] Is it possible to know the data type of a specialized generics class?

[Xiangrong Fang]

> But it's not a good idea as you'd still need to convert Data to a TObject
> (e.g. by using a cast), but that will fail if Data is something else than a
> pointer-like type...
>
> This worked in my TTree class (destructor):

  if PTypeInfo(TypeInfo(Data))^.Kind = tkObject then TObject(Data).Free;

I don't know in what case it will fail? I tested with a TStringTree, could
you please give an example that it will fail?
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