[Bug libstdc++/68869] map::insert(P&&) broken in some cases

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68869

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That's a recent edit to the draft, not yet part of the standard. I don't think
it was meant to change any behaviour, so I don't consider this a bug in
libstdc++ until I get some clarification whether this change is intended or
not.