#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() -> Result<(), core::num::ParseIntError> {
    let string = "1,2,123,4";
    let (numbers, lengths): (Vec<_>, Vec<_>) = string
        .split(',')
        .map(|s| s.parse().map(|n: u32| (n, s.len())))
        .collect::<Result<_, _>>()?;
    assert_eq!(numbers, [1, 2, 123, 4]);
    assert_eq!(lengths, [1, 1, 3, 1]);
    Ok(())
}