syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"#[cfg_attr(feature"}]}
source_snippet: #[cfg_attr(feature = "nightly", rustc_pass_by_value)]
context_before: #[cfg_attr(feature = "nightly", derive(Decodable, Encodable, HashStable_NoContext))]
context_after: pub enum Variance {