}, Shoe { size: 10, style: String::from("boot"), }, ]; let in_my_size = shoes_in_size(shoes, 10); assert_eq }, Shoe { size: 10, style: String::from("boot") }, ] ); } } 示例 13-16：使用 filter 方法和一个捕获 shoe_size 的闭包 shoes_in_size