{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"///"}]}
/// 'nested' types (e.g. `Foo` in `Option<Foo>`).
/// we can walk in order to obtain precise spans for any
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable, Encodable, Decodable)]