syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"#[allow(rustc::potential_query_instability)]"}]}
source_snippet:             #[allow(rustc::potential_query_instability)]
context_before:             // Because of this, it is fine to rely on the unstable iteration order of the map.
context_after:             let mut foreign_expn_data: Vec<_> = data.foreign_expn_data.iter().collect();