src/doc/book/listings/ch09-error-handling/listing-09-08/src/main.rs

   1 // ANCHOR: here
   2 use std::fs::File;
   3 use std::io;
   4 use std::io::Read;
   5
   6 fn read_username_from_file() -> Result<String, io::Error> {
   7     let mut username = String::new();
   8
   9     File::open("hello.txt")?.read_to_string(&mut username)?;
  10
  11     Ok(username)
  12 }
  13 // ANCHOR_END: here
  14
  15 fn main() {
  16     let username = read_username_from_file().expect("Unable to get username");
  17 }