How to manually return a Result<(), Box>?

Question

I want to return an error from a function in case a condition is true:

use std::error::Error;

pub fn run() -> Result<(), Box> {
    //         


        

Answer 1

I am new to Rust, but here is my dirty hack to return custom errors, given that the function is set to return Result<(), Box>:

fn serve(config: &Config, stream: TcpStream) -> Result<(), Box> {
    // ...
    if request_is_bad() {
        // This returns immediately a custom "Bad request" error
        Err("Bad request")?;
    }
    // ...
}