Practice: implement `Display` trait for `slice` wrapper

gistfile1.rs

use std::fmt::{ Debug, Display, Formatter, Result };
use std::string::ToString;

#[derive(Debug)]
struct Slice<'a, T: 'a> {
    data: &'a [T]
}

impl <'a, T: ToString> Display for Slice<'a, T> {
    fn fmt(&self, f: &mut Formatter) -> Result {
        let xs: Vec<_> = self.data.into_iter().map(|i| i.to_string()).collect();
        write!(f, "[{}]", xs.join(", "))
    }
}

fn double_prints<T: Debug + Display>(t: &T) {
    println!("Debug: `{:?}`", t);
    println!("Display: `{}`", t);
}


fn main() {
    let array = ["hello", "world", "rust", "programming"];
    let vec: Vec<_> = (1..11).collect();

    double_prints(&Slice { data: &array });
    //=> Debug: `Slice { data: ["hello", "world", "rust", "programming"] }`
    //   Display: `[hello, world, rust, programming]`
    double_prints(&Slice { data: &vec })
    //=> Debug: `Slice { data: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] }`
    //   Display: `[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]`
}