https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109113
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- And C++ ICEs on this starting with r8-4783-gd68ddd2b35078ab61f164b268b (again, accepts the g case). C++ used to ICE on struct C i = { .e = { { .b = 0, .c = { 1 } }, f } }; since that revision but since r8-5342-ga8c55cacaf8fa1e90f9e26c it also rejects it.