Hello, world

Every Rust program starts running at a function called main. To print a line of text, use the println! macro. The ! tells you it is a macro, not a normal function: macros can do things functions cannot, like take a variable number of arguments and check a format string at compile time.

fn main() {
    println!("Rust is fun");
}

Your task

Change the program so it prints exactly:

Hello, world!