Value * v = drv.queryMeta(name);
    if (v) {
        state.forceValue(*v);
        if (v->type == tString)
            return v->string.s;
        else if (v->isList()) {
            string res = "";
            for (unsigned int n = 0; n < v->listSize(); ++n) {
                Value v2(*v->listElems()[n]);
                state.forceValue(v2);
                if (v2.type == tString) {
                    if (res.size() != 0) res += ", ";
                    res += v2.string.s;
                }
            }
            return res;

    Strings res;
    std::function<void(Value & v)> rec;
    rec = [&](Value & v) {
        state.forceValue(v);
        if (v.type == tString)
            res.push_back(v.string.s);
        else if (v.isList())
            for (unsigned int n = 0; n < v.listSize(); ++n)
                rec(*v.listElems()[n]);
        else if (v.type == tAttrs) {
            auto a = v.attrs->find(state.symbols.create("shortName"));
            if (a != v.attrs->end())
                res.push_back(state.forceString(*a->value));

    }
    return "";

    };
    Value * v = drv.queryMeta(name);
    if (v) rec(*v);
    return concatStringsSep(", ", res);