hx509_certs_ref
anchors = hx509_certs_ref(ctx->trust_anchors);
anchors = hx509_certs_ref(context->default_trust_anchors);
ctx->trust_anchors = hx509_certs_ref(set);
hx509_certs_ref (hx509_certs /*certs*/);
hx509_certs c = hx509_certs_ref(certs);