https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71446
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- GCC 4.7 through 7.x emit: sorry, unimplemented: non-trivial designated initializers not supported here (and 4.6 and earlier didn't support C++11 enough to grok it). That said, you're right, the skipping is implemented regardless of the -std= mode, though you get -pedantic warnings if you do before -std=c++2a: warning: C++ designated initializers only available with -std=c++2a or -std=gnu++2a
