{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"#[derive(Copy,"}]}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable, Encodable, Decodable)]
/// 'nested' types (e.g. `Foo` in `Option<Foo>`).
#[derive(TypeVisitable, TypeFoldable)]