https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70277
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- It's allowed by Annex B in the standard (although I don't see specific mention of a suggested minimum for the number of initializers in a braced-init-list): Because computers are finite, C++ implementations are inevitably limited in the size of the programs they can successfully process. Every implementation shall document those limitations where known. This documentation may cite fixed limits where they exist, say how to compute variable limits as a function of available resources, or say that fixed limits do not exist or are unknown.
