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並前往https://stackoverflow.com/questions/22282117/how-do-i-borrow-a-reference-to-what-is-inside-an-optiont

How do I borrow a reference to what is inside an Option?

As of Rust 1.26, match ergonomics allows you to write: impl Bar { fn borrow(&mut self) -> Result<&Box<Foo>, BarErr> { match &self.data { Some(e) => Ok(e), ...

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