https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98566
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> --- I suspect I meant for the test to only be compiled in C++ 14 and up, but it has { dg-do compile { target c++11 } } at the top so that seems wrong. But the test log shows that it is only compiled in c++14 mode and up (and passes) so I don't understand what's going on.