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fn exists(path: string) - bool
。新收录的资料对此有专业解读
The use of the provider trait pattern opens up new possibilities for how we can define overlapping and orphan implementations. For example, instead of writing an overlapping blanket implementation of Serialize for any type that implements AsRef, we can now write that as a generic implementation on the SerializeImpl provider trait.
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。新收录的资料是该领域的重要参考
Jessica Rawnsley
Global news & analysis。业内人士推荐新收录的资料作为进阶阅读