> ifは式なので、let文の右辺に持ってくることができますhttps://doc.rust-jp.rs/book-ja/ch03-05-control-flow.html#let%E6%96%87%E5%86%85%E3%81%A7if%E5%BC%8F%E3%82%92%E4%BD%BF%E3%81%86
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