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並前往https://codereview.stackexchange.com/questions/180782/read-contents-of-file-with-appropriate-error-handling-rust

Read contents of file with appropriate error handling (Rust)

Therefore, you could write Ok(f) here instead of Ok(mut f) . ... use std::fs::File; use std::io::Read; fn main() { let path = "bar/foo.txt"; ...

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