[Bug libstdc++/121180] std::any allows for creating multiple empty objects of the same type at the same address

[tkaminsk at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121180

--- Comment #9 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> ---
> So it would make sense for std::any to avoid creating objects in itself when 
> this issue can arise.

The situation when such issue can arise is dynamic condition, so this will
entail disabling small object optimization entirely. I think the issue is an
defect in the standard, as the standard is meant to allow SSO, and thus stored
object to be nested withing any.