Rust Essentials - Second Edition

Error-handling with try!

In the same way as we did for reading a file, we could also use the try! macro when writing to a file, like here:

// code from Chapter 11/code/write_file_try.rs: 
use std::path::Path; 
use std::fs::File; 
use std::io::prelude::*; 
use std::error::Error; 
use std::io; 
 
struct Info { 
    name: String, 
    age: i32, 
    rating: i32 
} 
 
impl Info { 
    fn as_bytes(&self) -> &[u8] { 
        self.name.as_bytes() 
    } 
 
    fn format(&self) -> String { 
        format!("{};{};{}\n", self.name, self.age, self.rating)  
    } 
} 
 
fn main() { 
    let path = Path::new("info.txt"); 
    let display = path.display(); 
 
    let file = match write_file(&path) { 
        Err(why) => panic!("couldn't write info to file {}: {}", 
                           display, 
                           Error::description(&why)), 
        Ok(file) => file, 
    }; 
} 
 
fn write_file(path: &Path) ...