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pub fn notify(item: &(impl Summary + Display)) {\n

pub fn notify<T: Summary + Display>(item: &T) {\n

pub fn notify<T>(item: &T) where T:Summary + Display {\n

→pub fn notify<T>(item: &T) where T:Summary + Display {\n

https://doc.rust-jp.rs/book-ja/ch10-02-traits.html#複数のトレイト境界を構文で指定する\n

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