Apple LWG 2067:...

Apple LWG 2067: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3318.html#2067 .  This is the only actionable change that has been made to the C++ draft since C++11.  In general it has not been decided exactly how libc++ will track changes made to C++11.  New features and design changes will probably be #ifdef'd, especially if they are not backwards compatible.  Defects and 'dumb mistakes' are more likely to just be put in.  Decisions on telling one from the other will be made on a case by case basis.

llvm-svn: 160608