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

[redi at gcc dot gnu.org]

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

--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-12-09 
19:32:28 UTC ---
The issue is what the "correct" definition of the trait is, but I think we need
a DR to clarify it