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並前往https://www.reddit.com/r/rust/comments/e03piv/why_do_you_have_to_use_as_ref_rather_than_just/

Why do you have to use `as_ref` rather than just `&`? : r/rust

For types which impl Deref , you should be able to in most cases use & and let deref coersion handle the rest (e.g. &String to &str ). Upvote 54

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