Currently I use an approach as below

use std::{error::Error, thread};
fn main() {
    let thread = thread::spawn(move || {
        let try = || -> Result<(), Box<dyn Error>> {
            let mut res = 0;
            for _ in 0..7 {
                res += 2;
                if res > 4 {
                    return Err("too much".into());
                }
            }
            Ok(())
        };
        if try().is_err() {
            println!("err in thread processing")
        }
    });
    thread.join();
    println!("thread ended")
}

it works great, however if I want to analyze the error in a caller thread, there is no such function as:

println!("error in thread {}", thread.get_err());

AI recommend to use a channel to get a thread error in the caller thread, however I do not want to introduce a channel just for errors. Which approach do you use?

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