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- // &mut u8を引数に取り、&u8を返す関数を受け取る
- fn test<F: Fn(&mut u8) -> &mut u8>(f: F) {
- f(&mut 0);
- }
- fn main() {
- // test(|x| x);
- // identityだとエラー
- test(std::convert::identity);
- }
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