Function sum_of_val2

code/chapter01/rust_basic.rs:12–14

优化版

(nums: &[i32], num: i32)

// 优化版
fn sum_of_val2(nums: &[i32], num: i32) -> i32 {
    nums.iter().sum::<i32>() + num
}

fn main() {
    let num = 10;