auto config = std::make_unique<::Config>();

        auto config = std::make_unique<HydraConfig>();

                drv.outputs.insert_or_assign("out", DerivationOutput {
                    .path = outPath,
                    .hashAlgo = "",
                    .hash = ""
                });

                drv.outputs.insert_or_assign("out", DerivationOutput { .path = outPath });

    std::unique_ptr<Config> config;

    std::unique_ptr<HydraConfig> config;

        : config(std::make_unique<::Config>())

        : config(std::make_unique<HydraConfig>())

    : config(std::make_unique<::Config>())

    : config(std::make_unique<HydraConfig>())

            e.addPrefix(fmt("while loading build %1%: ", build->id));

            e.addTrace({}, hintfmt("while loading build %d: ", build->id));

            missing.insert_or_assign(i.first,
                DerivationOutput { i.second.path, i.second.hashAlgo, i.second.hash });

            missing.insert_or_assign(i.first, i.second);

class Config;

class HydraConfig;

    std::unique_ptr<Config> config;

    std::unique_ptr<HydraConfig> config;

struct Config

struct HydraConfig

    Config()

    HydraConfig()

        if (hydraConfigFile && pathExists(*hydraConfigFile)) {

            for (auto line : tokenizeString<Strings>(readFile(*hydraConfigFile), "\n")) {