rust error test

main.rs

use std::error::Error;

fn main() {
    match f1() {
        Ok(_) => {}
        Err(e) => {
            println!("{}", e);
        }
    }
}

fn f1() -> Result<(), Box<Error>> {
    if true {
        let msg = "错误信息";
        return Err(Box::from(format!("Error: {}", msg)));
    }
    // try!(f1);
    Ok(())
}