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並前往http://man.hubwiz.com/docset/Rust.docset/Contents/Resources/Documents/doc.rust-lang.org/1.34.1/book/ch09-02-recoverable-errors-with-result.html

Recoverable Errors with Result - API Manual

Here we tell Rust that when the result is Ok , return the inner file value out of the Ok variant, and we then assign that file handle value to the variable ...

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