That's the entire definition. Any type with an Error() string method is a valid error. This means errors in Go carry arbitrary unstructured information, every package invents its own error types, and the compiler has absolutely no idea what errors a function might return. The ecosystem built on top of this (errors.Is(), errors.As(), fmt.Errorf("%w")) is entirely a set of runtime conventions, not compile-time guarantees.
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一是先从品牌性不强、消费者尝新意愿强的品类（比如零食）入手试点。，更多细节参见17c 一起草官网
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这一连串离谱又充满戏剧性的事件，都指向同一个主角。