[Bug libstdc++/51452] has_nothrow_.*constructor bugs

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51452

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-12-07 
17:38:39 UTC ---
yes, I keep forgetting that noexcept should be implied on dtors now