public/subjects/panic

panic

Instructions

Write a function that tries to open a file and panics if the file does not exist.

Expected Function

pub fn open_file(s: &str) -> File {

}

Usage

Here is a program to test your function:

use std::fs::File;
use std::fs;
use panic::*;

fn main() {
    let filename = "created.txt";
    File::create(filename).unwrap();

    let a = open_file(filename);
    println!("{:?}", a);
    
    fs::remove_file(filename).unwrap();

    //It must panic
    let b = open_file(filename);
}

And its output:

$ cargo run
File { fd: 3, path: "panic/a.txt", read: true, write: false }
thread 'main' panicked at 'File not found'
$