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

[hjl.tools at gmail dot com]

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

            Bug ID: 63860
           Summary: Ill-formed std::pair::swap implementation?
           Product: gcc
           Version: 4.8.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com

According to

http://llvm.org/bugs/show_bug.cgi?id=21565

and

http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20141110/118441.html

std::pair::swap implementation in libstdc++ in GCC 4.8.3 is ill-formed.
I checked trunk and it isn't changed.  Is libstdc++ wrong here?