使用Refcell时，引用卡住了对Ref的手动释放怎么办

use ...

fn dialog<'a>(txt: &str, ext: &'a AstNode<'a>)-> Result<String>{...}

fn work(txt: &str){
    let options = init();
    let arena = Arena::new();
    let root : &Node<'_, RefCell<Ast>>= parse_document(&arena, txt, &options);
    for child in root.children(){
        match ...{
            NodeValue::Paragraph => {
                let g_child :Ref<'_, Ast> = child.first_child().unwrap().data.borrow();
                let value = &g_child.value
                match value {
                    NodeValue::Text(txt) => {
                        mem::drop(g_child);
                        let html = dialog(&txt, child).unwrap();
                        println!("speech: {html}");
                    },
                    _ => ()
                }
            },
            _ => ()
        }
    }
}
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