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並前往https://coderwall.com/p/folq8w/try-macro-for-the-option-type-in-rust

try!() macro for the Option type in Rust (Example) - Coderwall

struct MyErrorType; let last = try!(vec![1,2,3].last().ok_or(MyErrorType)); // strings are convertible to errors, so you can use them too.

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