rust 逐行读取文本

use std::io::prelude::*;
use std::fs::File;
use std::io::BufWriter;
use std::io::BufReader;

fn main() {
    let file = File::open("./ico.txt").unwrap();
    let mut fin = BufReader::new(file);
    for line in fin.lines() {
        println!("{}", line.unwrap());
    }
}

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