[Bug libstdc++/53657] [C++11] pair(pair&&) move constructor is non-trivial

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53657

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-06-14 
09:17:51 UTC ---
it was also non-trivial in 4.5.0, but not 4.5.1+