https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65171
--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> --- Problem is an invalid swap removal in: bool boost::test_tools::tt_detail::report_assertion(const boost::test_tools::as\ sertion_result&, const boost::unit_test::lazy_ostream&, boost::unit_test::const\ _string, std::size_t, boost::test_tools::tt_detail::tool_level, boost::test_too\ ls::tt_detail::check_type, std::size_t, ...) Something going on with subreg handling.
