Comment by raggi

good catch. feeding it the error output of rustc it then produces:

    use std::fs::File;
    use std::io::{self, Read};

    fn read_file_character_by_character(path: &str) -> io::Result<()> {
        let mut file = File::open(path)?;
        let mut contents = String::new();

        file.read_to_string(&mut contents)?;

        for c in contents.chars() {
            println!("{}", c);
        }

        Ok(())
    }

    fn main() {
        let path = "path/to/your/file.txt";

        if let Err(e) = read_file_character_by_character(path) {
            eprintln!("Error reading file: {}", e);
        }
    }