{"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
            let uri = to_proto::url(snap, position.file_id);
        if let Some(nav_data) = snap.analysis.goto_implementation(*position).unwrap_or(None) {
            let line_index = snap.file_line_index(position.file_id).ok()?;