syntax_data: {"ast_node_type":"variable","tokens":[{"end":36,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let local = place.local;
context_before:         if let Rvalue::Ref(_, BorrowKind::Mut { .. }, place) = rvalue {
context_after:             if let Some(def_id) = self.is_const_item(local) {