syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let mut foreign_expn_data: Vec<_> = data.foreign_expn_data.iter().collect();
context_before:             #[allow(rustc::potential_query_instability)]
context_after:             foreign_expn_data.sort_by_key(|(id, _)| (id.krate, id.local_id));