13.1.1.2. 记录错误信息到控制台

正确的错误处理会将异常视为错误。下述实例中，通过 log 便捷宏 log::error!，将错误记录到 stderr。

fn execute_query(_query: &str) -> Result<(), &'static str> {
    Err("I'm afraid I can't do that")
}

fn main() {
    env_logger::init();

    let response = execute_query("DROP TABLE students");
    if let Err(err) = response {
        log::error!("Failed to execute query: {}", err);
    }
}