https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119325

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
maybe

#define RESIZE_VECTOR(to_t, from) \
 ({ \
   __auto_type __from = (from); \
   to_t __to;
   memcpy (&__to, &__from, MIN (sizeof (to_t), sizeof (from))); \
   __to; \
 })

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