LC_CTYPE_MASK
if ((mask & LC_CTYPE_MASK) == 0)
TEST_ER(newlocale, EINVAL, _LOCALE_NONE, LC_CTYPE_MASK, NULL);
TEST_ER(newlocale, ENOENT, _LOCALE_NONE, LC_CTYPE_MASK, "");
TEST_R(newlocale, _LOCALE_UTF8, LC_CTYPE_MASK, "");