Error handling based on thiserror type, with a variant to catch "all other errors" using anyhow

main.rs

//! Error handling based on thiserror type, with a variant to catch "all other errors" using anyhow.
use std::fs::read_to_string;

#[derive(thiserror::Error, Debug)]
pub enum MyError {
    #[error("some other error")]
    FileNotFound,

    #[error("anyhow error: {0}")]
    Anyhow(#[from] anyhow::Error),
}

fn into_anyhow<E: std::error::Error + Send + Sync + 'static>(err: E) -> anyhow::Error {
    err.into()
}


fn read_file(path: &str) -> Result<String, MyError> {
    let res = read_to_string(path);
    match res {
        Ok(contents) => Ok(contents),
        Err(err) => {
            if err.kind() == std::io::ErrorKind::NotFound {
                Err(MyError::FileNotFound)
            } else {
                Err(into_anyhow(err))?
            }
        }
    }
}

fn main() {
    match read_file("test.txt") {
        Ok(contents) => println!("File contents:\n{}", contents),
        Err(e) => println!("Error: {}", e),
    }
}