结构体 集合。它只会返回指定鞋码的鞋子。 文件名：src/lib.rs #[derive(PartialEq, Debug)] struct Shoe { size: u32, style: String, } fn shoes_in_size(shoes: Vec, shoe_size: u32) -> Vec { shoes.into_iter() size: 10, style: String::from("sneaker"), }, Shoe { size: 13, style: String::from("sandal"), }, Shoe { size: 10, style: String::from("boot"), }, ]; let in_my_size = shoes_in_size(shoes, 10); assert_eq!( in_my_size