extension PureYAML.Parsing.LibYAML {
    /// A scanner token, mirroring `yaml_token_t`: a kind plus its start and end
    /// marks. Token-specific payloads (scalar value, anchor name, tag) are added
    /// as their fetchers are ported.
    struct Token: Equatable {
        var type: TokenType
        var startMark: PureYAML.Parsing.Mark
        var endMark: PureYAML.Parsing.Mark
    }
}