enum_variant_is_function.rs

#[derive(Debug)]
enum Say {
    Hello(String), // == `fn Hello(s: String) -> Say`
    Hej(String),   // == `fn Hej(s: String) -> Say`
}

fn say(msg: String, f: fn (s: String) -> Say) {
    println!("{:?}", f(msg));
}

fn main() {
    say("world".to_string(), Say::Hello);
    say("sverige".to_string(), Say::Hej);

}