{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
                    let (suggestion, borrow_kind, panic_if) = match mutable {
                } else if tcx.is_diagnostic_item(sym::RefCell, inner_id) {
                        Some(Mutability::Not) => (".borrow()", "borrow", "a mutable borrow exists"),