{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"Err(e)"}]}
            Err(e) => match e.downcast::<Cancelled>() {
            Ok(lsp_error) => lsp_server::Response::new_err(id, lsp_error.code, lsp_error.message),
                Ok(cancelled) => return Err(HandlerCancelledError::Inner(cancelled)),