convert from MarkedYaml to Yaml

[siosw]

is there any straightforward way of doing this? I think a helper or even Into impl would be great from a users pov.

i came up with this but that's probably not a great idea

fn unmark<'a>(input: MarkedYaml<'a>) -> Yaml<'a> {
    match input.data {
        YamlData::Value(value) => Yaml::Value(value),
        YamlData::Representation(str, style, tag) => Yaml::Representation(str, style, tag),
        YamlData::Mapping(mapping) => Yaml::Mapping(
            mapping
                .into_iter()
                .map(|(k, v)| (unmark(k), unmark(v)))
                .collect(),
        ),
        YamlData::Sequence(sequence) => {
            Yaml::Sequence(sequence.into_iter().map(|e| unmark(e)).collect())
        }
        YamlData::BadValue => Yaml::BadValue,
        YamlData::Alias(alias) => Yaml::Alias(alias),
    }
}