TYPE_LEN
__u32 types[TYPE_LEN/sizeof(__u32)];
.type_len = TYPE_LEN,
.str_off = TYPE_LEN + LAYOUT_LEN,
.layout_off = TYPE_LEN,
ASSERT_EQ(hdr->layout_off, TYPE_LEN, "layout_off_nonzero");
ASSERT_EQ(hdr->str_off, TYPE_LEN, "strs_after_types");