In this case, CreateAny will construct an `any' by `any(T())', with `T = any', which move-constructs from a temporary empty `any'. This causes the check for a empty `any' to fail, and the validation does not even run.
In the case where `T=any', since we cannot construct an `any' which itself holds an `any' (except by super tricky shenanigans), we can simply use the default constructed `any' object (instead of the object stored by the `any') as the object storage for the validation step.
Yuriy Toporovskyy
Mike Balfour
alexpete