Adam, many thanks for the answer!

On 11 May 2016, at 11:43, Adam Wulkiewicz <adam.wulkiewicz@gmail.com> wrote:

Thanks for the info! No, this is a bug. Could you please report it here (https://svn.boost.org/trac/boost/newticket)?

reported! https://svn.boost.org/trac/boost/ticket/12189