Re: [boost] variant2 never empty guarantees (was: Re: Outcome/expected/etc/etc/etc)

Gottlob Frege wrote:

Agreed. But I don't see much value in the never-empty guarantee if it doesn't give you the strong guarantee.

I'm not sure I understand this fully; could you please explain from what expressions, and under what conditions, you expect the strong guarantee? variant v1, v2; X x; v1= v2; // do you expect strong guarantee here? v1 = std::move(v2); // here? v1 = x; // here? v1 = std::move(x); // here? v1.emplace<X>(); // here?