{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":".on_sync_mut::<notifs::Cancel>(handlers::handle_cancel)"}]}
            .on_sync_mut::<notifs::Cancel>(handlers::handle_cancel)
        NotificationDispatcher { not: Some(not), global_state: self }
            .on_sync_mut::<notifs::WorkDoneProgressCancel>(