extension PureYAML.Parsing.LibYAML {
    /// A parser error, mirroring `yaml_parser_set_parser_error[_context]`: an
    /// optional context describing the surrounding production, the immediate
    /// problem, and the mark where it was detected.
    struct ParserError: Error, Equatable {
        var context: String?
        var problem: String
        var mark: PureYAML.Parsing.Mark
    }
}