https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112876
--- Comment #2 from 康桓瑋 <hewillk at gmail dot com> --- I believe the above is well-formed after LWG 4016. In addition, container-appendable requires `c.emplace(c.end(), *it)` to be well-formed but `auto end = c.end(); c.emplace(end, *it);` may not be. Sorry for the pedantic.
