Rust でテキストファイルの作成

sudo apt install rustc

$ rustc --version
rustc 1.41.0

// --------------------------------------------------------------------
/*
    text_create.rs

                        Jul/09/2020
*/
// --------------------------------------------------------------------
use std::env;
use std::fs::File;
use std::io::{Write};

fn main() -> std::io::Result<()> {

eprintln!("*** 開始 ***");

let args: Vec<_> = env::args().collect();

let ref fname_out = args[1];

let mut file = File::create(fname_out)?;
file.write_all(String::from("t2381\t名古屋\t71842\t2005-9-12\n").as_bytes())?;
file.write_all(String::from("t2382\t豊橋\t14278\t2005-3-15\n").as_bytes())?;
file.write_all(String::from("t2383\t岡崎\t65291\t1950-10-2\n").as_bytes())?;
file.write_all(String::from("t2384\t一宮\t31864\t1950-6-22\n").as_bytes())?;
file.write_all(String::from("t2385\t蒲郡\t49158\t1950-8-14\n").as_bytes())?;
eprintln!("*** 終了 ***");
Ok(())

}

// --------------------------------------------------------------------

text_create: text_create.rs
    rustc text_create.rs
clean:
    rm -f text_create

$ make
rustc text_create.rs

$ ./text_create cities.txt
*** 開始 ***
*** 終了 ***