extension PureYAML.Parsing.LibYAML {
    /// The anchor and tag scanned ahead of a node's content, with the marks needed
    /// for events and tag-resolution errors. Mirrors the locals in
    /// `yaml_parser_parse_node`.
    struct NodeProperties {
        var anchor: String?
        var tagHandle: String?
        var tagSuffix: String?
        var startMark: PureYAML.Parsing.Mark
        var tagMark: PureYAML.Parsing.Mark
    }
}