BTF_FIELD_ITER_IDS
err = btf_field_iter_init(&it, btf_type, BTF_FIELD_ITER_IDS);
err = btf_field_iter_init(&it, t, BTF_FIELD_ITER_IDS);
r = btf_field_iter_init(&it, t, BTF_FIELD_ITER_IDS);
err = btf_field_iter_init(&it, split_t, BTF_FIELD_ITER_IDS);
err = btf_field_iter_init(&it, t, BTF_FIELD_ITER_IDS);
err = btf_field_iter_init(&it, nt, BTF_FIELD_ITER_IDS);
case BTF_FIELD_ITER_IDS:
err = btf_field_iter_init(&it, t, BTF_FIELD_ITER_IDS);
err = btf_field_iter_init(&it, t, BTF_FIELD_ITER_IDS);
err = btf_field_iter_init(&it, t, BTF_FIELD_ITER_IDS);
err = btf_field_iter_init(&it, dst_t, BTF_FIELD_ITER_IDS);
if (!ASSERT_OK(btf_field_iter_init(&it_ids, t, BTF_FIELD_ITER_IDS),