Rust trait to parse the next item from `Iterator<Item=&str>`

parse_next.rs

trait ParseNext {
    fn parse_next<T: FromStr>(&mut self) -> T;
}

impl<'a, I: Iterator<Item=&'a str>> ParseNext for I {
    fn parse_next<T: FromStr>(&mut self) -> T {
        self.next().unwrap().parse().unwrap()
    }
}

fn main() {
    let parts = "91 23 45 67 89".split_ascii_whitespace();
    
    let a: u16 = parts.parse_next();
    let b: u32 = parts.parse_next();
    let c: i16 = parts.parse_next()
    let d: i32 = parts.parse_next();
    let e: usize = parts.parse_next();
    
    println!("{} {} {} {} {}", a, b, c, d, e);
}