一篇关于它.要为您的错误获得一流的支持，您需要做两件事:

There's an excellent post about it. To get first-class support for your error you need to do two things:

• 实现Error trait 适合您的类型.
• 为要与 ? 运算符(quick_error crate 有助于自动执行此操作.

• Implement the Error trait for your type.
• Implement std::convert::From for error types you want to use seamlessly with the ? operator (the quick_error crate helps automate this).