# Pastebin NoBXcIt6
        std::vector<CScript> subscripts;
        if (m_script_arg) {
            FlatSigningProvider subprovider;
            if (!m_script_arg->ExpandHelper(pos, arg, cache_read, subscripts, subprovider, cache_write)) return false;
            out = Merge(out, subprovider);
        }