[Bug libstdc++/112876] ranges:to: c.end() is unnecessarily assigned by the return value of c.emplace()

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112876

--- Comment #7 from 康桓瑋 <hewillk at gmail dot com> ---
(In reply to Jonathan Wakely from comment #6)
> Fixed, thanks again for catching this divergence from the wording.

Although the status of this LWG 4016 has not been updated on github, I can
assume that it has been accepted by LWG, right?
In addition, I would like to mention that `using _RefT =
range_reference_t<_Rg>;` in ranges#L9286 can be removed because there is no
place to use it.