mbrtoc32
size_t mbrtoc32(char32_t *__restrict, const char *__restrict, size_t,
__weak_alias(mbrtoc32,_mbrtoc32)
mbrtoc32(char32_t *restrict pc32, const char *restrict s, size_t n,
ATF_CHECK_EQ_MSG((n = mbrtoc32(&c32, NULL, 0, &ps)), 0, "n=%zu", n);
size_t, mbstate_t *restrict) __unused = mbrtoc32;