There is a rather bad bug in is_postfix_incrementable in the detail/is_incrementable.hpp header file. I noticed this when I was looking at how I can remove the dependncies in is_incrementable.hpp on the deprecated Type_traits header files in Version2 of type_traits. The bug looks totally obvious to me. It's that the is_postfix_incrementable metafunction is derived from the is_incrementable_::impl<T> implementation rather than the is_incrementable_::postfix_impl<T> implementation. I am sure this was just a copy-paste problem but evidently has been in the header file from the beginning. Can we fast forward the simple fix to the new release ? I posted this just to be sure I haven't missed anything in the file. I believe that only the iterator library currently uses the is_incrementable and is_postfix_incrementable metafunctions in its tests. Since it is Boost detail no end-user should be using it. Still we should have it correct, shouldn't we, in our release ?