Rc<RefCell<T>>搞定不了循环引用。
这些帖子里有些观点感觉很不错
https://users.rust-lang.org/t/why-do-all-docs-say-refcell-is-bad/37086
https://users.rust-lang.org/t/if-you-use-enough-rc-refcell-t-does-rust-become-a-garbage-collected-language/61152/7
https://www.reddit.com/r/rust/comments/8jd43f/ownership_and_data_structures_that_arent_trees/
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