https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70093
--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Ugh, a combination of a nested function and a VLA-in-a-struct. We're trying to allocate variable-sized temporary. Guess that's a wrong thing to do, we should generate __builtin_alloca or __builtin_alloca_with_align when expanding the call.
