> しかし、明示的にreturnを述べる必要はありません。これが関数の最後の式だからです。ここだけユルいw
https://doc.rust-jp.rs/book-ja/ch09-02-recoverable-errors-with-result.html#%E3%82%A8%E3%83%A9%E3%83%BC%E3%82%92%E5%A7%94%E8%AD%B2%E3%81%99%E3%82%8B
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