{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"let"}]}
                let attrs = RawAttrs::new_expanded(db, &item, span_map, loc.krate.cfg_options(db));
                let item = ast::Item::cast(speculative_args.clone())?;
                attrs.iter().find(|attr| attr.id == invoc_attr_index).and_then(|attr| {