[Bug libstdc++/91456] std::function and std::is_invocable_r do not understand guaranteed elision

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91456

康桓瑋 <hewillk at gmail dot com> changed:

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--- Comment #6 from 康桓瑋 <hewillk at gmail dot com> ---
(In reply to Jonathan Wakely from comment #5)
> Fixed for 9.3 too.

Should is_nothrow_invocable_r be fixed too?