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並前往http://web.mit.edu/rust-lang_v1.25/arch/amd64_ubuntu1404/share/doc/rust/html/book/first-edition/error-handling.html

Error Handling - The Rust Programming Language

It would be better if we showed the code for unwrapping because it is so simple, but to do that, we will first need to explore the Option and Result types.

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