Result & Panic 这次讲得详细,从错误的来历及简写过程, 都写明白了, 先浅,再深,先深,再浅, 反复之, 学习王道~ use std::fs::File; //use std::io::ErrorKind; fn main() { //panic!("crash and burn"); //let v = vec![1, 2, 3]; //v[99]; /* let f = File::open("hello.txt"); let f = match f { Ok(file) => file, Err(error) => match error.kind() { ErrorKind::NotFound => match File::create("hello.txt") { Ok(fc) => fc, Err(e) => panic!("Try create new file, but error : {:#?}", e), }, other_error => panic!("There was a problem opening the file: {:#?}", other_error), }, }; let f = File::open("hello.txt").map_err(|error| { if error.kind() == ErrorKind: