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並前往https://docs.w3cub.com/rust/std/result/enum.result

Enum std::result - Rust - W3cubDocs

Examples. Basic usage: let x: Result<i32, &str> = Ok(-3); assert_eq!(x.is_ok(), true); let x: ... pub fn map_err<F, O>(self, op: O) -> Result<T, F> where

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