{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":".on_sync_mut::<notifs::WorkDoneProgressCancel>("}]}
            .on_sync_mut::<notifs::WorkDoneProgressCancel>(
            .on_sync_mut::<notifs::Cancel>(handlers::handle_cancel)
                handlers::handle_work_done_progress_cancel,