errors_issue.rs

fn log(value: &String) -> Result<(), LoggingError> {
    if value.len() > 10 {
        return Err(LoggingError::TooLong);
    }
    println!("{}", value);
    Ok(())
}

fn get_registry_value(key_path: &str) -> Result<String, io::Error> {
    let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
    let key = hklm.open_subkey(key_path)?;

    let value: String = key.get_value("my_key")?;
    log(&value)?;
    Ok(value)
}