extension PureYAML.Parsing {
    struct EventStreamComposedNode {
        var value: PureYAML.Model.Value
        var mappingKey: PureYAML.Parsing.EventComposer.ComposedMappingKey
        var mark: PureYAML.Parsing.Mark
        var sequenceItems: [EventStreamComposedNode] = []
        /// The located projection, populated only when the composer tracks locations.
        var located: PureYAML.Model.LocatedValue?
    }
}