case bitc::METADATA_OLD_NODE: return "METADATA_OLD_NODE";
case bitc::METADATA_OLD_FN_NODE: return "METADATA_OLD_FN_NODE";
case bitc::METADATA_NAMED_NODE: return "METADATA_NAMED_NODE";
case bitc::METADATA_OLD_NODE: return "METADATA_OLD_NODE";
case bitc::METADATA_OLD_FN_NODE: return "METADATA_OLD_FN_NODE";
case bitc::METADATA_NAMED_NODE: return "METADATA_NAMED_NODE";