为什么可以？运算符是否将字符串转换为Box<dyn Error>？

use std::error::Error;
use std::fmt;

// 自定义错误类型
struct CustomError {
    message: String,
}

impl fmt::Display for CustomError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.message)
    }
}

impl Error for CustomError {}

fn main() {
    // 将字符串转换为Box<dyn Error>
    let error_message = "Something went wrong";
    let error: Box<dyn Error> = Box::new(CustomError {
        message: error_message.to_string(),
    });

    // 错误处理
    match do_something() {
        Ok(result) => {
            // 处理成功情况
        }
        Err(err) => {
            // 处理错误情况
            println!("Error: {}", err);
        }
    }
}

fn do_something() -> Result<(), Box<dyn Error>> {
    // 在这里可能会产生错误
    Err(Box::new(CustomError {
        message: "Something went wrong".to_string(),
    }))
}