[Bug libstdc++/63860] Ill-formed std::pair::swap implementation?

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63860

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Most likely because 4.8.3 did not fully implement C++11.