[Bug libstdc++/120259] Using Incomplete&& as argument in invoke_r/move_only_function fails to compile

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120259

--- Comment #4 from Tomasz Kamiński <tkaminsk at gcc dot gnu.org> ---
> I agree we should revert the static_assert for the swappable traits.

I am most concerned with is_invocable family here.